Thinking Putty comes in 30 colors, including glow-in-the-dark, heat-sensitive, and electric-colored putty. It can stretch like rubber and bounce like a ball, and because its silicone-based, it wont dry out or crumble over time. Its part toy, part stress reliever, part physical therapy and entirely addictive. Once you start playing, its hard to stop! These heat-sensitive colors really make their mark!. * Hypercolor Thinking Putty is thermochromic -- just a touch from your hands or a warm coffee mug will reveal a new, "hot" color. * Allow it to cool off, or stick it in the fridge! The "cool" color will be restored. * Made in the USA. * Each tin is and packed with 1/5 lb. of Thinking Putty!. *Amethyst Blushs soothing color will ease your nerves. With just a touch, the purple fades to reveal a surprising pink blush! Exciting and bright, this dynamic putty is sure to perk up your day!Made with the Best Quality Material with your child in mind. Top Quality Children's Item.