Old Dutch Hammered Solid Hourglass Tumblers, 12 Oz, Copper, Set of 4 Solid copper is hand-hammered Nickel lined and lacquered to resist tarnishing Tarnish-Resistant lacquer = no polishing This set of 4 makes it perfect to enjoy with your guest It'll keep it's bright finish for years to come Hand wash with warm soapy water and hand dry thoroughly