Food Grade silicone: Our Stretch Lids are dishwasher safe, washable, reusable and will not warp or leak. BPA free,FDA safe and Non-toxic,durable, soft texture, tear resistance, with super wear resistance Cycle Use:The silicone lid can resistant to high and low temperature, the use of temperature range -40 ℃ ~ +240 ℃,can be used for refrigerators, microwave ovens, electric oven Convenient to Use: Quick to seal and open your bowl, see-through window cover, easy for you to find the vegetables or tastes you. looking for Keep Food Fresh: Good leak tightness helps with keeping food fresh.Conform to any shaped bowl whether round,square,rectangular, hexagon,etc. The silicone food saver lids can be used to cover cooked food, fruit, salads, sauces, as well as drinks like coffee, tea, juice and more. It will help your food and leftovers stay fresh longer. Perfect for travel and outdoor affairs to keep your food and liquids cover it shouldn't spill Various size lids fit various food containers-Silicone storage covers come in 6 sizes (2.5", 3.7",4.5", 5.7",6.5" and 8.3") ) so there's always one that fits. Material: Silicone Keep your food fresh Stretchable to easily fit a utensil 100% leakproof & reusable 6 pieces for different sizes of utensils Non-toxic & heat-resistant