The Steel Loop Cap is leak proof and creates a 100% stainless environment inside your bottle. Made from 18/8, food-grade stainless steel, threads included, your drinks never touch plastic. Dishwasher safe. Compatible with Classic Klean Kanteens only. NOTE: not intended for use with hot beverages.. Features -. Durable, all-stainless design. Handy attachment loop. Cap is leakproof. Cap creates all-stainless interior. Dishwasher safe. Patented Klean Design. Compatible with Classic Klean Kanteens only. Specs -. Weight 2 ounces (56.7 g). Size 2.65\" H x 2.1\" W (67.3 mm H x 53.34 mm W). Leakproof Yes. Note Not for use with hot beverages