Lekue 12-Piece Muffin-Cup Set, Assorted 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 De-molding: for perfect results allow the food to cool completely; to remove pull sides away gently and press on the base until the cake comes away; please freeze mousses before de-molding to avoid breaking Oven safe to 500f; can also be used for cold recipes and can be stored in the fridge to -76f Thick quality structure for better support; store folded with no risk of becoming deformed Dishwasher safe; 15-year warranty