Live in color! GelGems® bring color to your bathroom, kitchen, office and windows. Technically speaking, GelGems® are a mechanically resistant, semi-solid, thermoplastic polymer. What this jumble of words fails to communicate is how fun GelGems® are. They’re fun to touch, fun to play with, fun to peel off and re-stick to any clean, dry, smooth, temperate, non-tinted glass surface. They stick to windows, mirrors, glass dividers or any other glass surface. They’re washable and re-usable; they peel off easily and don’t leave any marks.