【New & Unopened】Pyon Pyon Nendo (Bouncy Clay) Experiment Research Educational Toy Super Ball Clay Experiment Kit Fuji Cosmo Science Product Description Why does it bounce and stretch, even though it's clay!? A mysterious clay made of bouncy and stretchy silicone. You can make other colors by mixing them. Includes a detailed instruction manual that explains how it works. <Set Contents> 3 colors of clay, Instruction manual Thank you for viewing. I am selling this to organize my collection. It has been stored in a cardboard box in a new, unopened condition. Although it is new and unopened, please note that there may be some minor scratches or scuffs on the outer box due to being stored at home by a private seller. Please check the photos. Please refrain from purchasing if you are sensitive to such details.