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8 assorted gems
Easy to grab foam pieces stick to any smooth surface once wet
and excavator's tools
be sure not to over inflate
bumper car
Bouncing Planets Stacking & Sorting 8 assorted gemsMake five colorful, rubbery balls resembling planets in minutes. Using a spherical mold and five colors of polymer granules, cast up to five rubbery planet models. Learn why the balls form and how the elasticity of the polymer material causes them to bounce. Ages 8 and up.
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