40mm Titanium Case with fixed bezel. IP Gun Plating. Titanium Screw-in Embossed Signature USMC Emblem Caseback Titanium Crown with Multiple O-rings Sapphire Crystal with Antireflective Coating (for glare-free viewing) Water Resistant to 100 Meters Dependable Japanese Citizen/Miyota Super 2035 Quartz 3-Hand Movement (with 4-year battery) Genuine Italian Waterproof Leather Strap with Titanium Signature Buckle Swiss Self-powered Pro-Glo T100 Illumination System Glows Continuously for 25 Years (no need to be "charged" by an external light source, and glows 100X time brighter than conventional photoluminescent lume systems) This series uses the largest tritium tubes available for enhanced night glow lume! Weight: 48.4 grams, Thickness: 11mm, Lug width: 20mm