Astro shop 6pc x Adorable Anti-dust Silicone Glass Cup Cover Coffee Mug Cover Lids Suction Seal Lid Cap Size:11cm/4.25inch Designed for Cups, Mugs, cocktails, small bowls or canned food Seals tight on all smooth rims: Ceramic, Stainless steel, Glass, Plastic and Melamine Safe for microwave, freezer and dishwasher FDA approved silicone, BPA Free