Experience the cool effects of Crazy Aaron’s Thinking Putty® all in one set! The Greatest Hits Collection includes one 4” Super Magnetic Strange Attractor with magnet; one 4 UV Reactive Phantom Foxfire with black light keychain; one 2 Glow-in-the-Dark Ion; and one 2 Heat-Sensitive Hypercolor Sunburst. Made in the USA from high-quality materials, Crazy Aaron’s Thinking Putty is endless fun for everyone! Ages: 8+ Choking Hazard Not for children under 3 yrs. Small Parts.