Superman would have loved this krypton putty! Whether you use it as a stress ball, a squeeze toy or for therapy, you’ll love this radioactive green thinking putty. When you charge it with sunlight, it’ll glow for hours. In the dark, use the Blacklight Keychain to write secret messages on the putty or draw cool designs. This product is made in the USA and each tin holds 1/5 lb of putty. That’s way more than you’d get in a plastic egg! Great gift idea!