AmeriGlo Glock Pro-Glo Combination Set, Sights, Fits Glock 17,19,22,23,24,26,27,33,34,35,37,38,39, Green Tritium Lamp with Orange Outline Front, Green Tritium with White Outline Rear GL-241 Sight set with green tritium lamp" orange or luminescent green outline front and two green tritium lamp" white outline rear for Glocks. Highly visible under all lighting conditions. LumiGreen paint will glow brightly for 10 minutes after light exposure.