·Environmentally-friendly ·Features non-toxic, BPA-free, dishwasher-safe & leak proof, air-tight seal so foods stay fresh! Microwave-safe & heat-resistant to 450 F so you can quickly reheat & enjoy delicious leftovers. Can use in oven or fridge!!! ·Made from Food-Grade silicone, Stretch Lids are dishwasher safe, washable, reusable and will not warp or leak. ·Super Stretch Lids are a great way to keep your food safe and sealed. Conform to any shaped bowl whether round, square, rectangular, hexagon, etc