316L Surgical-Quality Stainless Steel Case Jeweled Seiko NH35 Automatic Movement Jewel Bearings: 22 Jewels Seiko 41 Hour Power Reserve Beats per Hour (BPH): 21600/Hour Sapphire-Coated Mineral Crystal Observation Case back to view Movement Uni-Directional Rotating Bezel Genuine Leather Strap Logo-Engraved Stainless Steel Clasp Luminous Hands Luminous Markers Date Display 42mm Diameter 10 ATM Water Resistance