Brand Rolex Model GMT-Master II Reference REP016828 Gender Men’s watch Movement Kinetic (Automatic) Case Diameter 39 mm Case Material Ion Plated Stainless Steel Band Material Ion Plated Stainless Steel Dial Color Black Quality Swiss (ETA) Glass Sapphire crystal Water Resistance Watches are water resistant but not waterproof, we do not recommend swimming with them or taking showers with them.