Food grade silicone: The raw materials of imported food-grade silicone, it is soft, texture, age-resistant, and has a good feel of the hand. It has excellent resistance to wear and tear, is natural and safe, non-toxic, odorless, non-corrosive. It conforms to food standard norms to protect the environment.High quality premium: are made of high quality food grade silicone, reusable and do not deform or do not flee. The silicone lid can withstand high and low temperature, the use of the temperature range40 ~ + 230, can be used to power the electric refrigerator, oven, microwave and oven.Multi size: They have 6 different sizes: Normal diameters are 6.5cm, 9.5cm, 11.5cm, 14.5cm, 16.5cm and 20.5cm, extendable to 8.9cm, 12.7cm, 15.2cm, 20.3cm, 22.9cm and 27.9cm approx. Suitable for most shapes and materials.Lid adjustable practices and reusable: perfect for stretching to adapt to all shapes and sizes, bowls, cups, mugs, and other vessels, whether they are round, square or rectangular tubes. Washable with water, reusable.Function: a good column of water keeps the food frais. Food in the potluck, stackable in the dip bowl, drinks, not finished or the leftovers of fruit and vegetables.