316L Surgical-Quality Stainless Steel Case Jeweled Seiko NH39 Automatic Movement Jewel Bearings: 24 Jewels 40-Hour Power Reserve Beats per Hour (BPH): 21600/Hour Sapphire-Coated Mineral Crystal Semi-Skeleton Dial Observation Caseback to view Movement 316L Surgical-Quality Stainless Steel Bracelet Logo-Engraved Stainless Steel Clasp Luminous Hands Luminous Markers24-Hour Sub-Dial 43 mm Diameter 10 ATM Water Resistance