You’ll be a happy camper knowing our Thinking Putty® tins are made of food-grade material that can be reused for crafts and projects or recycled with other metals like soup cans! When charged with the rainbow magnet, Happy Earth Thinking Putty® will gleefully dance around showing off its sparkling, mineral earth blue color. 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.