The Stainless mugs are equipped with high quality double wall stainless steel vacuum insulation construction that keeps beverages hot or cold for hours. • Stainless steel vacuum insulation keeps beverages hot or cold for hours • The twist-off lid makes the drinking experience more like drinking from a regular cup • Compact lid design has fewer parts for easy cleaning • 2-step method for disassembly and reassembly of lid ensures no accidental leaks, and helps prevent the loss of part • A special manufacturing technique was used to round the bottle opening, making it smooth and comfortable to the touch when drinking and cleaning • 1-5/8" (4cm) wide mouth opening accommodates full-size ice cubes, and is easy to fill • Made of BPA-free plastic and 18/8 stainless steel • Size (width x depth x height): 6.5cm x 6.5cm x 21.5cm • Heat retention: 71°C @ 6hrs • Cold retention: 8°C @ 6hrs • Buying Link: https://www.zojimall.com/ (https://www.zojimall.com/s-steel-vaccum-mugs/zojirushi-480ml-s-s-mug-sm-na-48)