These are stainless steel, double walled-insulated tumblers. This is a thermos style tumbler with a push open & close. Not only beautiful appearance, functional is also very good. Essential product for travel, exercise and fitness. Ideal gift for friends families and colleagues. PRODUCT DETAILS: Double Wall Vacuum Insulated Tumblers — AGH Skinny tumblers keep chilled wine cocktail coke cold for up to 4~7 hours, and keeps hot coffee tea hot for 3~6 hours. Without condensation, and easy to clean. Stainless Steel Healthy Tumbler — AGH insulated tumbler made of food grade 18/8 304 stainless steel, non-toxic, BPA-FREE, anti-rust, shatter-proof. Hand Wash ONLY, NOT Dishwasher and Microwave Safe. Size: 16OZ  product size 11 x 1.8 x 2.7 in —— 32OZ product size   14.2 x 2 x 2.9 in