XS Standard Dot Tritium Sights are the finest sights made for fast sight acquisition in all light conditions. Day-Light, Half-Light, or Low-Light, just "dot the i". Fast, simple and effective. This is the ultimate self defense sight system that provides sights you can see around the clock. Enhances sight acquisition in all light conditionsUltimate "Flash Sight" picture Excels in high stress defensive situationsImproves Low-Light accuracy Low profile, snag free designAvailable with Big Dot Tritium or Standard Dot Tritium front sight Trijicon Tritium vials Precision machined in Fort Worth, TX