Magic fluorescent UV reactive. Not your ordinary. Out'a this world! Got 'a have it. No sticky resigoo. Fun never dries out. See back fo deets. 2 3 V Batteries included. Draw & write with light. Reacts ot UV light. (1) Watch putty change color as you doodle with UV light. (2) Doodles fade and putty returns to its original color so the fun never stops. What else? Mold knead bounce twist stretch snap melt. Exputtyment with sunlight & black lights. Store putty in tin after play. The toy association.