There's so much to do with Thinking Putty - Hyper Color - 2 inch. Made in the USA, this silicone based substance is a unique stress reliever that you can stretch, tear, shape, roll, and squish. It's like chewing gum for your hands This hyper color putty is thermochromic--that means it changes color from the heat of your hands or a warm coffee mug. Thinking Putty isn't slimy or sticky and it won't leave a residue on your hands.