Super Expandable
Polymer Balls Kit

Just Add Water to Create a Multitude of Polymers!

Simply drop your tiny polymer balls into a cup of water and watch as they grow over 200 times in size in just a matter of hours! Includes dozens of Water Marbles, Spit Balls, and Glow in the Dark Spit Balls in eight vibrant colors. These amazing wonders of chemistry are slimy and gross to the touch. Weight: 15 grams. For ages 4+.