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  • Jelly Marbles - Clear Spheres

Jelly Marbles - Clear Spheres

Quick Overview

Superabsorbent giant growing polymer water beads that absorb 300 times their weight in water and grow into a perfect sphere that looks like a water marble.

Availability: In stock


Place these tiny, solid spheres in water, and in just a little while you will have your own Jelly Marbles. These superabsorbent water marbles are the newest craze around the Spangler Science offices! What starts out as a 3mm pebble, quickly becomes an approximately 20mm ball of jelly! Similar to our Water Jelly Crystals, these water beads absorb a lot of water, plus they maintain their spherical shape when they are done growing. Not only are these superabsorbent marbles fun, they teach a valuable lesson about the power of polymers. In fact, Jelly Marbles are an example of amazing Hydrogels... superabsorbent polymers that are saving the environment. Whether you think they look like water marbles, water beads, or clear spheres, you'll want to get your hands on these squishy, water-filled Jelly Marbles. 


Can't get enough of these growing Jelly Marbles? Check out our Jelly Marbles Kit!

What's Included?

  • 50 gram jar of Jelly Marbles (over 700 individual Jelly Marbles!)
  • True Colors Color Mixing Tablets
  • Activity guide

What Does It Teach?

Like all of our fun and fascinating polymer, or Hydrogel, products, these tiny spheres, teach a big lesson in color, light and the importance these thirsty pebbles can play in maintaining a healthy environment. The possibilities for experimentation are endless when you drop these spheres in water. Put them in one of our Baby Soda Bottles and they grow to the shape of the test tube. Try drying them out to see how quickly evaporation can take over… and then use them again and again. Plus, you can only imagine the fun to be had at the Spangler Science offices when Halloween rolls around... imagine the surprise when unsuspecting trick-or-treaters place their hands into a bowl of ooey, gooey, “eyeballs!”

Additional Information

Product FAQ
  • What happens if some of my spheres break?
    Don't worry, we've included an entire section in the activity guide with experiments you can do with broken Jelly Marbles?
  • How many spheres come in the packet?
    In the 50 gram jar, there are approximately 1,000 spheres!
  • How large to they get?
    They start out as only a 3 mm pebble and grow to approximately 20 mm!

Warning - Small Ball Choking Hazard

Product Tags

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  1. Discovery Galore review by Primary Science Teacher on 1/28/2015

    Students love these, and there is no end to the number of experiments that can be done with them. Great way to introduce and review scientific inquiry! Excellent bang for the buck! Comes in a great reusable jar too.

  2. Fun! review by Dawn on 9/27/2014

    Bought these for my 10 yr old niece's Science Birthday Party. The kids liked them but note they take a few hours (not really a little while) to get the full size. They don't really provide that instant gratification kids this age look for. We wanted the kids to be able to be part of and for them to see the full experiment from beginning to end, so we put the beads in that morning before the party and had a test tube of how they started to explain to the kids about the process but I don't think they had the same effect as the video my niece saw. Needless to say the kids enjoyed playing with them and had fun. Seemed the kids were more interested in the clear form than with coloring. They all wanted some beads to grow themselves. When we added Atomic Glow mix under a black light the kids loved it. This jar was more than enough and worth the price.

  3. love it review by ruby vela on 5/23/2014

    I think these are really good I play with them alot

  4. Great product for kids. review by Chris White on 5/20/2014

    I am an Early childhood teacher and my class loves Jelly marbles. My kids like watching them grow. We have made them in every color. We have had lot's of fun with Jelly marbles. Great product from Steve Spangler

  5. Diffusion review by Science Teacher on 5/3/2013

    The jelly marbles work great for showing diffusion through a semi permeable membrane. I put a drop of food coloring into a beaker along with a hydrated jelly marble. The food coloring will diffuse into the marble. Then you place the marble in a beaker with clear water. Watch as the water turns the color of the food coloring. Also, after hydrating the jelly marbles place a few of them in a beaker of salt water and watch what happens. The water will move down its concentration gradient and the marbles will lose water.

  6. So much fun! review by Yocheved on 3/13/2013

    My daughter (just turned 9) is absolutely obsessed with these things! We've smooshed them, frozen them, boiled them, used them to root cuttings and to water our plants. She bounces them all over the kitchen. She takes them into the bathtub with her. She's brought them over to all of her friend's houses and puts them in a plastic bag to carry around with her wherever she goes.

    It's been over a week now, and she's still trying to come up with new things to do with them!

    If you have a sensory seeking kid who has to touch EVERYTHING, then this is a perfect present. I'm thinking about getting her the jumbo size ones next. :-)

  7. Excellent product, lots of fun! review by Michael on 2/15/2013

    Love the jelly marbles! They are fun to watch grow and at each stage as they absorb more and more water. The kids loved them...a little too much actually...if you want them to last, don't let kids handle them too much and just have them look at them as these things break pretty easily. At any rate, they are a lot of fun and great for learning about absorption.

  8. Jelly Marbles review by Chris White on 1/3/2013

    My preschool class loves to play with jelly marbles. We grow some every week. We play with them when they are clear and we like to color them. Fun to put into a water table when they are clear and let the kids find them. Jelly marbles are also fun to color and teach the kids about color mixing. great way to teach the kids about polymers. My class would be lost without one of their favorite things to do. I have even sent some home with the kids to try at home. Great product

  9. Cross curriculum opportunity! review by Ellen Peterson on 12/24/2012

    I teach 6th grade science on a team of 4 teachers. It's hard to keep their interest from class to class but these spheres did the trick! I introduced them to our HIstory teacher who used them to demonstrate the concepts of hemispheres by cutting them in half and "axis" by putting a toothpick through them. Moving on to Math class, where we were studying area, circumference, radius, diameter, the math teacher was able to cut them in half and show the relationship of the area to the perimeter of a circle by using spheres rehydrated with colored water and making a stamp on the page of the sphere. In Science class, we explored the properties of super absorbent polymers and measured the progress of their growth to graph. Even the Language Arts teacher got in on the action by having the students write about what would happen if they spheres got loose in the river system nearby! One product brought our whole team together and brought the interest level WAY UP! This is an awesome product!

  10. Wander Fly Stick review by Eric Baker on 11/19/2012

    I teach 8th grade Physical Science and have ordered numerous products through Steve Spangler. I recently ordered, and received two Wander Fly Sticks. Neither one worked! It is February, in Illinois, so it is plenty dry. There is not enough power in the stick to generate an adequate amount of static to float the foil. I did, however, use my Van deGraf to generate enough power to float the foil and it worked well. Sorry, but the Fly Stick is a dud!

  11. My favorite product from Steve Spangler Science review by Mary Roberge on 10/27/2012

    THis one made me like science again. Great for pranks and teaching!

  12. Jelly Marbles review by Denise Dillman on 9/9/2012

    Kids loved them! We called them ghost eggs when we did Halloween Science. thank you for making science fun for my kids.

  13. Jelly Marbles Review review by Kristen Edgar on 7/27/2012

    This is great! The kids love it, and it came very fast. I'm pleased with this service. Thanks!

  14. Jelly Marbles review by Debbie Jones on 7/9/2012

    Loved them! They worked just as promised. I used them for "grapes" for kids to stomp in a Bible School play. The kids had a great time and wanted to know where I got them, so you may have a mad rush on orders soon!

  15. So much fun!! review by Mike Mick on 5/21/2012

    These were great! My son was disappointed after seeing a YouTube video claiming to be able to make these with some combination of baking soda/vinegar and some other ingredients. Lo and behold, Steve Spangler to the rescue! Both kids (and let's be honest, both adults too) absolutely had a blast with these. Plenty to go around and a little goes a long way. Thanks!!

  16. Jelly marbles! review by Lara on 3/30/2012

    Love these and the fact that they came with fizzy color changing tablets. My students enjoyed growing them and talking about the comparative sizes. They also noted the change from a hard sphere to a more gellatinous feeling. I loved discovering that they polymers would not absorb water and food coloring-they only changed color with the fizzing tablets. We extended our original exploration throughout the week and had many surprising observations...
    Great Material for all ages!

  17. Jelly Marbles review by Nathan Carlson on 3/6/2012

    I guarantee your kids want be able to keep their hands of these things. They love putting their hands into the water and magically pulling out a hand full of marbles. They seem to last forever too if you keep them in water.

  18. Great Fun! review by judy bastein on 2/19/2012

    I love the jelly marbles and will be using them this holiday as a center piece/decoration (using red and green water) around the house. I will have fun with them before I introduce 'another form of matter' to my students. I know they will bit a hit. Thank you!

  19. AWESOME review by brenda Emmert on 2/12/2012

    They were so neat. The kids loved them and we used them as "eyeballs" for a mystery halloween game. We also used the atomic glow and they thought that was the best thing ever. I am sending the extras to school for their science teacher to use. You get a decent amount, actually a lot for the price. Very nice and fun to do with the kids. They were checking the growth every hour or so.

  20. Great Little Marbles review by Mom of 3 girls on 1/29/2012

    These marbles really are impressive.
    They start out so small and grow to about 10x their original size (about the size of a grape).
    After they grow, they are invisible in clear water.
    Kids loved to handle them.
    They did break easily when squeezed.
    Made a great "eye of newt" for Halloween.

  21. Slippery, squishy fun review by Bethany Templeton on 1/6/2012

    I'm a children's librarian, and I ordered some products to start a weekend science program. The jelly marbles were on the list, and I dropped a few into a cup of water as soon as I opened the box. A few hours later, it was my favorite thing to show the kids (and coworkers). Dip your hand into what looks like a clear glass a water ... and you feel squishy jellies! Some kids wanted to drop new marbles into the water, others wanted to take a marble home to play with. They were a hit!

  22. Best Visual Ever! review by Jenny Brown on 12/15/2011

    I've used these as a visual for children, teens and adults and the reaction is always the same - amazement. It's like your eyes are playing tricks on you. Everyone has to touch them, they are so cool. I love that so many come in each package - more than enough for several demonstrations.

  23. Slow... product description a little misleading. review by DD on 11/4/2011

    In the product description it says :

    Place these tiny, solid spheres in water, and --in just a little while--- you will have your own Jelly Marbles. These superabsorbent marbles are the newest craze around the Spangler Science offices! What starts out as a 3mm pebble, ---quickly--- becomes an approximately 20mm ball of jelly! Similar to our Water Jelly Crystals, these Jelly Marbles absorb a lot of water, plus they maintain their spherical shape when they are done growing. Not only are these superabsorbent marbles fun, they teach a valuable lesson about the power of polymers. In fact, Jelly Marbles are an example of amazing Hydrogels

    Firstly it says in just "a little while" then layer "quickly becomes a 20mm ball"

    It actually takes an overnight soaking to achieve the full size.
    I timed the growtyh and after about 3-4 hours, they were about 6-7 mm..
    Bottom line... not effective for a single class demo.. You need to bring the students back the next day for them appreciate the growth effect. Not really "quikly" not a "little while"

    With respect, the video of this product does state 3-4 hours... but the product description should really state "overnight soaking required to achieve full size" as one is kind of expecting these to hydrate in about an hour or so.. based on the product description.

    If the description had been more telling about the time required, and I was an educator who had more than one day to get kids into science... i would give this product 3 stars...

  24. Halloween Fun review by Jan Mc. on 9/22/2011

    We used these for one activity at our classroom Halloween party. We got a big black cauldron and filled it with water and the spheres. (Just a bucket full of water, right? Wrong!) The game was "The Invisible Eyeball Challenge." We had the cauldron behind a curtain, and the kids came back one at a time. If they were brave enough to face the challenge and stick their hand into the cauldron, they got an eyeball-themed prize (bouncy eyeball, sticky eyeball, eyeball ring or eyeball bracelet). This was a huge hit with the kids and all the parents. After everyone had a turn, we showed everyone the spheres and discussed the science behind the fun.

  25. good review by Lauren on 9/7/2011

    this is soooooo cool!!!!!!!!!!!!!!!!!!!!!!!!!!! :)


  26. Loved it review by Don on 7/22/2011

    Hello, I have purchased quite a few of your products and have enjoyed them all. I do a science club with fourth and fifth grade students. I wish I could get other products that you have. My classroom is right at the front door. I noticed that two or three students would still be here a half hour after school was out. Parents were always late picking them up. One day I invited them into my classroom and gave them a few jelly marbles and told them what to do with them. I teach fifth grade and these students are third graders. Word had gotten around that third grade class and within the next two weeks they were stopping by after school asking if they could have some of those soft round balls. I only had a small amount left so I had to reorder for them. I also did the activity with my four year old grandson. He also really enjoyed it. Sometime I would like to get the necessary materials needed for the double-dipping activity. Thanks, Don K. Schmidt

  27. AWESOME review by Mike O'Connell on 6/15/2011

    I found out about these from the Steve Spangler video on YouTube. I knew I had to get some to play around with. My friends' minds are all totally blown now.

  28. Kids loved this review by JL on 6/7/2011

    I got this for my child's birthday party and the kids were amazed to see us pulled the spheres out of the water and then see them disappear into the water when the spheres were placed back into the water. We gave the kids a ziploc bag each which they filled with couple of spheres and some water to bring them home.

  29. Happy Jelly Marbles review by Tamara Lewis on 4/14/2011

    My daughter wanted the jelly marbles and chose to get them with her own allowance money, what a great purchase. You get everything for the money and wonderful learning activities meant for teachers, but just as good and even better for parents! Thanks!

  30. Fun in the kiddy pool review by Lisa on 3/30/2011

    Shhh...Don't tell anyone, but I used them with my two year old. He was highly supervised, of course, because I'm that kind of mom. Guess what?!? It's okay to do science with young children. My son LOVED these. He couldn't believe his eyes when we put them in water just before nap time and by the time he woke up, they were huge! Talk about the joy of discovering! I even got a little more crazy and threw a couple in his kiddy pool for him to find. It was a great game. We played this game for hours and it wore him out for a nice long nap.

  31. AMAZING!!!!! review by Delaney Walsh on 3/6/2011

    well... i think that these crystle marbles r the best! at my vacation bible school for science we made them and we got to take some home that were not big yet. i really think that they r the best!!!!!!!! (;

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