polypropylene, virtually unbreakable, dishwasher safe, can be used between -20°C and +120°C, usable in microwave ovens, with grip hole, stackable * Fits Wood & Sons® 9"" NHS plate, Churchill® 9"" Nova and Classic plate + Steelite® 9" Slimline plate, ** Fits Dudson® 9" NHS plate *** Fits on Churchill® 10" Classic + Nova plates