GelGems are decorative icons made of semi-solid thermoplastic polymer, which can be stuck on to windows, mirrors and glassware. In 2010, two sets of Sesame Street GelGems were produced by Kameyama Co., under the K-Design label. The Sesame icons include images of Big Bird, Cookie Monster, Elmo, Ernie, Bert, Grover and Rubber Duckie.