Silicone Muffin Molds; made of food-grade silicone, safe to use. Temperature Range between -100 F and +446 F. Microwave, oven, refrigerator, dishwasher safe. 3 shapes lunch box dividers in round, square, and rectangular patterns. You can mix and match them according to the shape of the lunch box and food, separating your meals well to prevent flavors from mixing. Compared to others, our molds are thicker, sturdier, and flexible at the same time. They are strong enough to retain their shape after food or batter is placed and stand steadily in the lunch box/baking tray without tilting or shifting. Reusable Muffin Molds; they can be reused thousands of times, which is more environmentally friendly and economical compared to paper molds. Non-stick Baking Molds; the cake will pop out when you push around it after baking, easy to take out. Easy to clean, just rinse with water or dishwasher cleaning.