As day passes into night, Crazy Aaron's Twilight Thinking Putty emerges. With only the heat of your hands Twilight changes from blue to purple. Set it down (if you can!) and absent the warmth of your hand the color will shift back. Like all Crazy Aaron's Thinking Putties, it can stretch like rubber and bounce like a ball, and because it's silicone-based, it won't dry out or crumble over time. It's part toy, part stress reliever, part physical therapy and entirely addictive. Once you start playing, it's hard to stop! Made in the USA. Ages 8+ WARNING: CHOKING HAZARD Not for children under 3 yrs. Small parts.