Stainless Steel Cold Drink Tumbler - Single Wall -16oz. Capacity - Red - Set of 6 These Sleek and Stylish Tumblers are great for the daily use of all your cold beverage needs. 18/8 Stainless Steel is both safe and hygenic Durable Single Wall Construction Tumbler cups are stackable and easy to clean. Hand wash. Not for microwave, dishwasher, cooking, or freezer use.