The revolution in thermos mugs—medium size—a unique combination of stainless steel and borosilicate glass, perfect thermal insulation (double-walled/vacuum) and an interior made of borosilicate glass (absolutely heat-resistant, flavor-neutral, and easy to clean without leaving residue like steel) - Durable & leak-resistant—the best part is that both cups (steel & glass) can be easily separated, used individually, and are extremely easy to clean. Complies with LFBG standards; capacities: approx. 325 ml (0.325 L) glass cup / approx. 400 ml (0.4 L) stainless steel cup; pack of 24. Craft paper box.