Silicone, flexible, reusable and Easy to clean. Microwave, oven, refrigerator, freezer and dishwasher safe. Silicone molds are for baking muffins and breads, preparing treats, desserts on a baking sheet and making candy. Our liners are designed to withstand thousands of times of use, saving you total money. Silicone molds are natural for making perfect shaped baking.