The Mainstays Double Wall Stainless Steel 10oz Wine Tumblers let you and your friends enjoy some vino wherever you are without the worry of breaking glasses. Enjoy indoors, outdoors, by the pool, or in your RV. These attractive and durable tumblers are perfect for entertaining or daily use. Place the lids on to help prevent spilling. Each tumbler can hold 11oz of your favorite beverage if you choose not to use the lid. For best results, do not microwave the tumbler and avoid washing them in the dishwasher. Cheers!