Crazy Aaron's 4" Mystic Glacier UV Reactive Inc Blacklight Keychain
(You save $3.80)
UV Reactive Putty changes colour in sunlight, glows a different colour in the dark, and reacts to the included glow keychain in a strange and mysterious way! You can use Thinking Putty as a toy, a stress ball, a squeeze toy, or as therapy putty. Made in the USA.