Finally, AmeriGlo delivers a quality night sight that is a target shooters dream come true. Features include the thinnest white outline tritium front sight available at .125 wide. The press in rear sight features an extra wide notch for faster sight acquisition and 2 tritium lamps available in yellow or green. The rear sight appears plain black during the day and glows at night. The lamps require no power or light source for illumination. All AmeriGlo night sights carry a 12 year warranty on the illumination.