Zojirushi Hana+Kana Collection mugs are equipped with high quality double wall stainless steel vacuum insulation construction that keeps beverages hot or cold for hours. The tight-fitting flip-open lid with safety lock makes drinking from the mug easy, and prevents beverages from spilling. 2-step lid release process prevents excess condensation on the stopper from being flung off while the lid opens Tight-fitted flip-open lid keeps beverages hot or cold Safety lock to prevent the lid from opening accidentally A special manufacturing technique was used to round the bottle opening, making it smooth and comfortable to the touch when cleaning 1-5/8" (4cm) wide mouth opening Made of BPA-free plastic and 18/8 stainless steel "Hana+Kana" collection has modern and sophisticated patterns with the motif of traditional Japanese "flower (hana)" prints (silver and pink) and "kana" characters (black and white) Capacity: 16oz. / 0.48L Inspirations from everyday life The history of the Zojirushi mark goes back to a glass-lined vacuum bottle created in 1918. This bottle for home use was created using vacuum insulation—a breakthrough technology at the time. In the years since then, Zojirushi has established itself as a top manufacturer of household products and has continued to leverage the latest technologies to create a constant stream of leading-edge products that make life more comfortable and convenient. Based on this philosophy, Zojirushi has used its advanced technologies to develop an impressive household lineup over the past nine decades.