Sertodo Copper, Square Napa Bottle Coaster, Hand Hammered 100% Pure Copper, 5.5 Inch square, Single 100% PURE COPPER -inherently clean material with strong antimicrobial, antibacterial and antifungal properties DIMENSIONS - 5.5 inch square SUPERIOR QUALITY - our hammer polish beats shine, beauty and durability that lasts for generations NO LACQUER - or coating on our copper will wear off unevenly or into your food/drink