ASSIS 5 Pcs Silicone Diamond Design Watertight Cup Lid Mug Lid Cover Cap Block Dust Leakproof Lid (Random different color) Diamond designmodern minimalist style,noblefashionable Non-SlipLeakproofDustproofNon-stickAirtight seal prevents spills Food-grade silicone + Acrylic diamondTemperature:-40-250,oven and microwave safe Diameter11cm (4.3") Fit Cup/mug opening: less than 9.5cm(3.7")