Trijicon Bright & Tough Night Sights changed the iron sight landscape, and continue to offer a superior alternative to traditional sights. They are chosen by major handgun manufacturers and are standard issue with numerous local, state and federal law enforcement agencies for a reason: They're effective in any lighting situation, and designed to take a beating and maintain absolute accuracy. Bright & Tough Night Sights are a self-luminous, three-dot night sight alternative to traditional iron sights. Tritium phosphor-filled glass lamp provides battery-free glow, allowing for a visible sight picture in all lighting situations. They are contained within protective aluminum cylinders and have additional silicone rubber cushioning. White-painted rings around tritium lamps enhance user's ability to see sight picture in bright-light shooting situations. Each Trijicon tritium lamp is capped with a sapphire jewel that helps evenly distribute the light from the lamp and also acts as an additional layer of protection from puncture and cleaning solvents.