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, Skeleton Dial, Observation Caseback to View Movement, Logo-Engraved Stainless Steel Crown, 316L Surgical-Quality Stainless Steel Bracelet, Logo-Engraved Stainless Steel Push-Button Butterfly Clasp, Luminous Hands, 45mm Case Width, 150-230mm Wrist Size, 5 ATM Water Resistance.