SP101Y: Springfield HD Night Sight Set - Yellow Front Specifically created to address the needs of tactical shooters. Three dot green tritium night sight set?s front sight features a taller blade and an aiming point ringed in photoluminescent paint while the rear sight is outlined in black and features a wider U-shaped notch Increases visibility and quickens front sight acquisition?even in transitional lighting. Front surface of the rear sight is steeply hooked to assist in emergency one-handed slide operation Green tritium lamps are warranted for 12 years from date of manufacture.