Made of premium 18.8 Stainless Steel material  Light weight & Portable - suitable for the elder and also easy to bring around Inner Body Layer - Tin Coated Layer Automatic lid cap Stylish & elegant design - best fit for modern kitchen Keep warm & cold guarantee Safe and healthy Durable and long lasting Volume: 1100ml Color: Black , White Product Code: D3111-08 , D3111-11 Size (length*width*height): 10.5cm x 10.5cm x 26.5cm Relax thermal products are made from food grade SUS304 stainless steel material (18.8).Relax insists on using premium 18.8 Stainless Steel material for all its steel products.This is to ensure only high quality and long lasting products are delivered to the end user.Relax 18.8 Stainless Steel Thermal Flask keeps your drink warm/cold all day long with its double wall , the insulation keeps your favorite drink warm/cold for hours. Test results shown below: 6 Hours ± 77.9℃ ;12 Hours ± 68.5℃ Initial temperature ≥ 98℃, with Environment temperature 30±2 ℃