ArmourLites Pocket Series Watch are constructed to be adventure ready while boasting style fitting for formal occasions. 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 with a beautiful chrome finish. Seiko YM24a alarm clock quartz timepiece movement ensures the you wake up on time. Stainless steel case. Case dia: 46mm. Wt: 3 oz. Colors: Black Face, White Face. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Pocket Watches.