Crazy Aaron's is one of our favorite brands. Crazy Aaron's Thinking Putty is just so much fun for all ages. We often describe Crazy Aaron's Putty as putty on steroids because it can do so much. They have putty that changes color with heat and cold, they have putty that will react to a magnet, they putty that will glow in the dark, and many more. The putty is proudly made in the USA.