Stainless Steel Coffee mug 18/8 Stainless steel or other material Safety Screw to make sure the safety Stainless steel coffee mugFeatures: 1) Material: Stainless steel.2) Double Valve can be sure the safety3) Size:1/2cup,2cup,4cup(200mL), 6cup(300mL).9cup(450mL)4) Colors: good mirror shinning color with high grade quality. Stainless steel Coffee mug