Brand Rolex Model GMT-Master II Reference 126710BLNR Gender Men’s watch Movement Kinetic (Automatic) Case Diameter 40 mm Case Material Brushed Stainless Steel Band Material 904L Grade Stainless Steel Dial Color Black Quality Japanese (Miyota) Glass Sapphire crystal Water Resistance Water resistant but not waterproof. You can shower with it. but it’s not advisable to dive with the watch.