Old Dutch Solid Flared Tumblers, 12 Oz, Copper, Set of 4 Of course they're also perfect for outdoor entertaining, being naturally durable and shatterproof Solid copper with unlined, untreated interiors and lacquer-treated exteriors that resist tarnishing Set of 4 tumblers, 12. Oz. Capacity each Adds a perfect twist to your party with these tumblers By using this glass along with other copper tableware items you will get an authentic dining experience