Sertodo Copper CSHK-SET Boston Maraka Cocktail Shaker Set, Hand Hammered 100% Pure Copper, 18 oz Cup, 30 oz Cup 100% PURE COPPER - inherently clean material with strong antimicrobial, antibacterial and antifungal properties CAPACITY - 30 ounce and 18 ounce cups SUPERIOR QUALITY - our hammer polish beats shine, beauty and durability that lasts for generations NO LACQUER - or coating onour copper will wear off unevenly or into your food/drink SOLID SEAL - no leaks, no stuck caps