3 years & up. Experience glow-in-the dark effects and heat-changing colors, encouraging investigation and discovery. There are three different types of putty: Chameleon Hypercolor Putty where a tropical green explodes into a bright fluorescent yellow with just a touch of heat; Super Scarab Illusions Putty with an incredible color shift from blue into purple right through to red and copper; and Liquid Glass Crystal Putty that starts out clear as glass then develops a cloudy appearance that quickly fades back to crystal clarity once you put it down. Add these putties to your collection of sensory toys in the classroom! Each tin has 3.2 oz. each. Available separately or in a set of three.