Meprolight USA 415453131 Mepro Hyper-Bright Self-Illuminated Sights Fixed Tritium Orange Front, Green Rear Black Frame for HK 45, 45C, VP9 Meprolight Hyper-Bright fixed pistol sight features an extremely bright contrasting colored ring front sight. The tritium is illuminated green to provide low-light and nighttime aiming capabilities. The contrast in colors of the two components helps the shooter focus on the front sight quicker, which is critical in defensive and competitive shooting.