The silicone lids Rated -40 C (-40 F) to 232 C (450 F). High quality and excellent flexibility, strong adsorption and super sealing effect, can be washed and disinfected in boiled water . Material: 100% food grade silicone,FDA (USA), LFGB (German) and SGS (Australian) approved materials, non-toxic,odourless,harmless to our body,reusable,environmental friendly . Expandable: The food covers can be stretched, covers such six sizes as 2.6'', 3.8'', 4.5'',5.7'', 6.5'' and 8.3'' etc and can adapt to 2.75-10'' containers . Multipurpose: Use to cover fruits & vegetables or cups, bowls, mugs, dishes, cans, refrigerator and microwave . Easy for using and cleaning,these lids can stretch to any shape and still provide an airtight seal,such as cup, kettle, food pot and special-shaped vessels .