ArmourLites Caliber Series Watch with a Stainless Steel 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 ensures incredible shock resistance and watertight construction. Watch the Seiko NH38 Automatic timepiece movement through a mechanical window. The automatic movement works through your arms natural movements, eliminating the need for winding or batteries. Deposition (PVD) stainless steel band. Water resistant to 200 meters. Case dia: 47mm. Wt: 2 oz. Colors: Blackout, White, Black/Cream, Black/White. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Color: Stainless steel. Gender: Male. Age Group: Adult. Type: Analog Watches.