This baking sheet set is made of premium stainless steel, without any chemical materials, great replacement for aluminum pan. Most importantly, baking pan is rust and warp resistant, the cookie sheet can be reused for a long time.The small baking sheet is highly mirror polished to reduce the risk of food sticking. Smooth edges of sheet pans for baking to avoid injury to your fingers. And stainless steel baking sheet set is heat up evenly and heat distributed during baking, which will avoid over baking.Stainless steel cookie sheet is non-sticky, so when cleaning baking set, gently scrub with soapy water only. And as long as you fully remove any oil/grease each use, small cookie sheets will remain bright and clean.