food-grade silicone, . Eco-friendly, non-toxic, flexible, reusable and . Silicone are naturally stick to make popping out. Our liners are designed to withstand thousands for time' usage, totally a money saver. Easy to . Microwave, oven, refrigerator, freezer and dishwasher safe. Silicone are great for clay and pendant making, also great for baking muffins, cupcakes and breads.