Having the right sights on your small, compact handgun can make the difference in a fight, and the XS Sights DXT2 Big Dot night sights are built right to encourage the front-sight focus needed to get fast, accurate rounds on target when it counts, even in low-light or nighttime conditions. Each pair of XS Sights DXT2 Big Dot night sights are built with a tritium-illuminated, round front sight that allow for fast targeting in the dark, while a photoluminescent ring around the tritium lamp also allows for easy aiming when moving from bright to dark environments. The front sight is combined with the company's rear-sight design that incorporates a vertical, tritium-illuminated stripe. Whe Mfg: Xs Sight Systems