"GIR's elegant, reusable silicone baking mats are an eco-friendly alternative to expensive parchment paper, non-stick spray, and aluminum foil. They're perfect for cookies, biscuits, rolls, roasting vegetables, frozen foods, and candy-making. Perfectly measured for standard half sheet baking pans and can be cut to fit any custom size. Withstands temperatures from -40 to 550 Degree F, microwave and dishwasher safe too." - GIR