This putty glows like nothing I have ever seen. It just sucks up the sunlight and brilliantly radiates it back to you. It's a joyous green in the light, and in the dark, it's a radioactive super glowy green — great fun day or night. This elemental putty is a non-Newtonian matter that acts like a FLUID and a SOLID. It can also stretch, bounce, shatter, and other cool stuff. Soon, I will be putty in your hands. 50 grams of glorious putty in a 7.5x4 hangable package and a 12-piece point-of-sale Back to school STEM! Putty=great sensory play A favorite unique gift Our packaging makes our products at home in many retail settings: science museum store toy store gift store childrens museum store stationery store art museum