Product Material: silicone Before use: please clean the molds and disinfect them in boiling water. After use: please protect from direct sunlight. Packing list: 36-piece set of muffin cups 1.Kit Includes: Set of 36 cupcake cups, 9 shapes, such as star, circle, heart, square, donut, seven-petal flower, rose, sunflower, snow mountain. 2. Reusable Baking Cup BPA-free free, FDA approved, flexible, reusable and durable. Food grade silicone, ideal for baking, snacking, etc. 3.Use Manual: Freezer Safe, Microwave Oven Safe (up to 260C), Easily release baked goods without additional fat or cooking spray; dishwasher safe for quick cleaning, odor and stain resistant. 4. Lunch Makes Irresistible Besides baking muffins Cupcakes, the silicone molds are also suitable for culinary creations such as chocolate desserts, small chicken casseroles, mini quiches and jello baked treats a breeze. Our cupcake liners are designed to withstand thousands of times use, totally a money saver.