It is Made of Non-toxic Food-grade Silicon. Flexible, Reusable & Durable. No Chemical Coatings, No Fillers, the Muffins Cup Molds Are Temperature Safe From -104 F to +446 F. More Durable for Your Longer Time Use. This Silicon Baking Cup Are Very Suitable for Making Baking Muffins, Desserts on Baking Trays, Preparing Frozen Snacks, Cakes, Pastries & Breads, Snack Cup, Etc.