316L Surgical-Quality Stainless Steel Case Jeweled Seiko NH35 Automatic Movement Jewel Bearings: 24 Jewels 28-Hour Power Reserve Beats per Hour (BPH): 21600/Hour Sapphire-Coated Mineral Crystal Skeleton Dial Observation Caseback to View Movement Genuine Leather Strap Logo-Engraved Stainless Steel Clasp Luminous Hands Luminous Markers Date Display 44mm Case Diameter 195-245mm Wrist Size 5 ATM Water Resistance