Premium Material: Our silicone suction lids is made of BPA free,FDA approved 100% food grade silicone, Environment friendly safe and non-toxic. It also has stable shape, strong tension and long service life. Simply wash it with your hands or throw it into the dishwasher. Multiple Functions:Our lids fit most smooth rimmed containers including stainless steel, metal, ceramic and glass. Shields food from dust, insects, and dirt ,Retains food freshness when having a picnic or outdoor barbecue. Anti-dust Airtight: Silicone suction lid seals tight on all smooth rims like cups, mugs and glasses, prevent from dust, airtight and leak proof. The cup lids silicone prevents liquid from sloshing out of the cup when you're working or in a moving vehicle. Temperature Range: -40C~230C (-40~446 F). Because of the heat resistant and cold temperature features, Use them for the microwave, stove, oven, fridge or to serve food at the table indoors or outside. Dimension& Package:Diameter 10.5cm/4.1",suitable for cups with a opening diameter of less than 10cm