Food Grade Silicone MaterialMade of BPA free, food grade silicone.No smell, durable, reusable, non-toxic. Colorful & Exquisite DesignPerfect for home, office and especially good as a camping cup lid to keep flies, wasps, and other unwanted bugs out of your drink and good choice to be a outdoor camping cover. one person a color, can clearly distinguish their own use of the cup. Temperature Range silicone glass drink covers can handle the extreme temperature from -40~480 F(-40~230 C). Can be used in microwave, refrigerator or oven. Airtight Lid & Keep Warm/ColdSeals 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. Easy To Clean cup lids have stable shape, strong tension and long service life. Simply wash it with your hands or throw it into the dishwasher.