Trans-forma HD series wheels’ waffle-design polyolefin wheel cores are chemically bonded to thermoplastic elastomer (TPE) treads for higher durometers than previous Transforma models. The TPE resists water damage from hydrolysis, supports heavy loads for long periods without flat spotting, and glides quietly while protecting surfaces.The wheels come in 4, 5 and 6-in. diameters with 2-in.-wide treads. They support weights from 600 to 900 lb, depending on wheel diameter. A range of bearing options is available.Colson Caster Corp., 3700 Airport Rd., Jonesboro, AR 72401, (800) 643-5515, www.colsoncaster.com