The mystery of the deep. Coral Reef starts out as a sea of sparkling blue, but its color shock technology holds a surprise inside. •Stretch this putty in the light to reveal a coral pink just beneath the surface. •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.