Zojirushi' s stainless steel vacuum insulation mug come with a removable stopper and are designed to drink directly out of the mug. They work like a regular mug, but will keep your beverage hot and cold for as long as 6 hours. They are light weight and durable. The compact design takes minimal space while maximizing capacity. Each flip lid is tightly fitted for excellent heat retention and features a safety lock to prevent accidental opening. Durable and sanitary, these mugs have a stainless steel interior with non stick coating for easy clean up. This tuff mug is constructed out of durable stainless steel and has vacuum insulation that will keep your beverages hot or cold for hours. Each mug has a plastic cover around the mouth and an easy to clean non stick interior. The compact design of this mug takes minimal space while maximizing capacity. About the brand: Zojirushi (pronounced ‘zoh-jee-roo-shee’) began in Japan in 1918 as a manufacturer of hand-blown glass vacuum bottles. Today, Zojirushi' s product line extends to high-end small appliances such as rice cookers, bread makers and coffee makers, high quality vacuum insulated products like vacuum bottles, lunch jars and carafes, commercial restaurant and coffee equipment. In the past few years, Zojirushi has enhanced the focus on design and how appliances fit into everyday lives with the introduction of a variety of new products. The name Zojirushi means “Elephant brand” in Japanese.