This hot water bottle is made of high quality stainless steel, anti-rust and durable. Superior insulation system, perfect hot water bottle. Ideal to use in office, home, travel. Specification: Condition:100% Brand New Material: stainless steel Color: Black,White, Golden(optional) Heat Preservation: 8-15 hours Weight: Approx.284g/10oz Package list: 1 * Stainless Steel Thermos Cup Note: 1. The hot water in the bottle will not stay 100 degrees 12 hours later. 2. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding. 3. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 【High-quality materials】This thermos cup is made of food grade stainless steel, safe, non-toxic and durable for long time use 【Beautifully made】Smooth rounded bottle mouth, comfortble to drink. Frosted bottle body, comfortable to hold 【Insulation system】Excellent insulation system, keeps your drink hot for about 8 hours for 60 degrees, 15 hours heat preservation for 40 degrees. It depends on the temperature you refill in the bottle and how many times you open or outer environmental temperature 【Leak-proof sealed】Leak-proof sealed, safe to put into bag. A open lock on the cover,which is prevent water spill 【Suitable for】This thermos cup is suitable for home, travel, outdoor, office, etc