ArmourLites Officer Series Analog Watch with Leather Strap takes tactical strength to the next level. They are the first to combine a shatterproof, anti-reflective and scratch-resistant sapphire crystal with tritium illumination. Common crystal lenses on watches are around 700 Vickers (the scientific scale that measures a substances hardness). ArmourLites glass was tested for a hardness rating of 6,000 Vickers. To match the strength of the glass, it was set into specially developed 316L stainless steel housing and suspended by a custom rubber retaining ring for incredible shock resistance and water-tight construction. Swiss Ronda 5040.D Quartz timepiece movement ensures the time stays correct. Stainless steel case. Water-resistant to 100 meters. Case dia: 45mm. Wt: 2 oz. Colors: Black Dial/Brown Leather, Cream Dial/Brown Leather. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Analog Watches.