Super Expanding Polymer Balls Kit
These miniature marbles have a lot more to them than meets the eye. Just add water and let the fun begin as the balls expand hundreds of times in size! The warmer the water, the faster they grow! Grow a variety of amazing balls - balls that glow, even balls that look like marbles and much more! They slip, slide, bounce, and break! Let them dry out and store them in a sealed bag to easily reuse for hours of ball bouncing fun!