Mimicking a magnificent desert sunset, Goodnight Cactus Thinking Putty® changes color with the heat of your hands. This triple change Hypercolor® captures the peaceful purple, luminous orange, and radiant yellow sundown of the night sky. Thinking Putty® helps build hand and finger strength through a fabulous tactile play experience with unique, unexpected properties and provides relaxing, yet stimulating interaction for anyone with sensory integration issues.Thinking Putty® is non-toxic, won't dry out, and won't leave a sticky or slippery residue on your fingers, so it's great for stretching, molding, bouncing, tearing, popping and playing by kids and adults alike. Ages 3 +