This groovy putty changes color with just the heat of your hands. The awesome effect makes it perfect for twists, duo-toned sculptures, 5-minute breaks, and other timeouts. Put it in the fridge then against a warm coffee mug to experience an even more intense color change. Thinking Putty is safe and non-toxic for children. Proudly made in the USA with the help of exceptional individuals challenged with disabilities. Tin is 2" and contains 0.47 oz of putty.