316L Surgical-Quality Stainless Steel Case Jeweled Automatic Movement Jewel Bearings: 21 Jewels 36-Hour Power Reserve Beats per Hour (BPH): 21600/Hour Sapphire-Coated Mineral Crystal Semi-Skeleton Dial Outer Disc Represents Hour Middle Disc Represents Minutes Inside Disc Represents Seconds Observation Caseback to View Movement Logo-Engraved Stainless Steel Crown 316L Surgical-Quality Stainless Steel Bracelet Logo-Engraved Stainless Steel Fold-Over Push-Button Clasp 43mm Case Diameter 10 ATM Water Resistance