18/8 Stainless Steel, .7Mm Thickness, Stackable Tray With Removable Silicone Rubber Insert. 14″ X 12″ X.75″ This Surface Will Prevent Slipping. Dishwasher Safe, But Hand Wash Recommended For Longer Life.Product Manufactured Before May 2012: Insert Was Made Of Eva (Ethylene Vinyl Acetate). Approved Switch To Rubber Nbr, Po# 10053, Product Code 9/14.