Lekue 12 by 16-Inch Non-Spill Baking Sheet, Black All lekue baking molds are made of platinum silicone and can go in the oven or microwave; platinum silicone molds are treated with special nonstick so only need to oil them before first use to activate the nonstick properties 1/2-inch sides keep liquids from running off the sheet Use as a baking sheet liner for easy clean up or use as a working mat Put in the oven rack to catch drips and keep oven clean Folds to store; dishwasher safe