Features Food Grade Materials Can be in direct contact with water Made from safe and durable food-grade silicone material Non-toxic harmless, safe and environmentally friendly, please rest assured tha more→t use. Good heat resistance. Heat resistance: -40Celsius~ 250Celsius/ -40Fahrenheit~ 480Fahrenheit Applicable scope A variety of round mouth smooth glass Ceramic Plastic Stainless steel Mugs,but only applicable diameter Less than or equal to 9cm the cup!(cup lid diameter=10.5cm) Flexibility is strong Flexibility is good, soft silicone material, not aging, repeated twist, not easy to deformation, can instantly restore the original appearance. Easy to clean Smooth surface. Good hydrophobicity,