Cambro Brushed Graphite Basics Plus 4 Shelf Add-On Units Solid Shelves, 18 x 30 x 72 inch -- 1 each.Made from lightweight, yet extremely durable, non-corrosive, composite material. Post Kits, Shelf Kits and optional accessories are packaged and sold individually allowing operators to build a shelving configuration to fit their storage needs, even in the most limited spaces. Break apart dovetails (marked with Left (L) or Right (R) ) speed up organization and installation. Material easily wipes clean and shelf plates are dishwasher safe. Resistant to scratching, peeling, warping and corrosion. Withstands temperatures as cold as -36 degree F (-38 degree C) or warm environments up to 190 degree F (88 degree C). Features a lifetime warranty against corrosion, eliminating the need for unnecessary replacement costs.