【Material】This muffin tray is made of food grade silica gel, heat and cold resistant, and can be safely used for baking and freezing. They are hygienic and durable. 【Unique Design】Because of the non-stick surface, your baked goods won't stick to the bottom of the baking tray and this silicone muffin tray is flexible so you can easily pop out the cupcakes with your fingers.