Crazy Aaron's 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, and for general experimentation by kids and adults alike. The Super Fly variety reflects iridescent tones of black, grey, silver, green and more. Color changes with how the lights hits. 4 oz, not for younger than 3, probably best for 6+