When the lights go out, your sidearm doesn't need to be left in the dark.Tritium night sights transition from standard white dot sights during the daylight, to glowing green dots in the dark.Tritium does not need batteries and does not need to be charged with light it simply glows! assembled in usa with quality swiss tritium for maximum brightness.Front sight length: 1.0".Front sight width: 1.0".Front sight height: 1.0".Rear sight length: 1.0".Rear sight width: 1.0".Rear sight height: 1.0".Rear Color: Green/TritiumFrame Material: CNC Machined SteelFrame Color: Black Nitride Fortress FinishFirearm Fit: Sig Sauer P-Series with #6 Front/#8 RearStyle: 3 Dot Set Tritium Square Front/Square-Notch RearFront Color: Green/TritiumFirearm Type: Handgun