This Lab Putty Sculpting Glass will keep kids entertained for hours! The crystal clear, stretchy putty looks like glass, feels like dough, and melts like ice. Mold it, knead it, bounce it, twist it, stretch it, snap it, and melt it. Unlike glass, when clouded with fingerprints, allow putty to rest and watch it return to crystal clear in minutes. No squeegee required! Recommended for ages 4 and up.