316L Surgical-Quality Stainless Steel Case, Jeweled Automatic Movement, Jewel Bearings - 21 Jewels, 42-Hour Power Reserve, Beats per Hour (BPH) - 21600/Hour, Sapphire-Coated Mineral Crystal, Observation Caseback to view Movement, Skeleton Dial, Genuine Leather Crocodile-Embossed Strap, Logo-Engraved Stainless Steel Clasp, Luminous Hands, Luminous Markers, 43mm Width, 5 ATM Water Resistance.