It is reusable, easy to store and environmental friendly. It is made of food grade silicone, non-toxic, non-stick and durable material. Safe to use in ovens, microwave ovens and refrigerator. You can use these silicone molds to make many different candies, truffles, keto fat bombs, peanut butter cup & ice cubes. It works like a charm. No rust and safe use of working tools. Buy Chocolate Chip Baking Tool at 100% off at ShoppySanta.