Walther Trijicon PPS HD Night Sight Set HIGH VISIBILITY COLORED FRONT SIGHT POST: Glow-in-the-dark photoluminescent paint aids visibility and quicker target acquisition in transitional light SUBDUED REAR SIGHT: Angled and serrated surface to reduce glare, and black painted rings to enhance focus on front sight "U" NOTCH REAR SIGHT: Specifically designed rear notch enhances front sight acquisition TRITIUM-PHOSPHOR LAMP: Tritium-filled glass lamp provides superior illumination in no light or low light settings FITS: Walther PPS, PPX, and PPS M2 models Trijicon HD Night Sights Fits the Walther PPS Tritium-filled glass lamp provides superior illumination in no light or low light conditions Green lamps are warranted for 12 years from the date of manufacture Professional installation recommended