Zanny Marbles Water Marble Ball are wet and wacky, soft and squishy, fun and funky, bouncy and beautiful. They start off hard and tiny. Add water and watch them grow to more than 400 times their volume.
Each pack size (inch): 7”L x 4”W x 1.5”D inch, Weight: 1.1 oz.
Non-Toxic, 100% Biodegradable, Non-Flammable
Now you can study this process in a test tube environment. This keeps kids fascinated for hours. Comes with a clear plastic test tube with twist-on plastic cap. Bring out the scientist in your kid with this water gel toy.