Silpat Cookie Sheet Liner by Harold Import. This designed for all types of ovens. From break baking to pastry making. Silpat can provide even heat transfer to your baked goods. Easy to clean. 12x16 Silpat nonstick baking sheets are made of woven glass coated with food-standard silicone. Used daily by professionals, the sheets offer multipurpose uses for preparing, cooking, and heating up food. They're also easy to clean--simply wipe them off using hot water and dish soap. The Silpat makes any baking sheet nonstick--no greasing necessary.