Beretta Nano Tritium Night Sights feature tritium gas-filled lamps with a sapphire front lens which focuses light and is impervious to solvents. The sapphire lens-enhanced tritium vial, is one of the brightest in the industry. The gas-filled lamps are silicone cushioned to take years of use and come with a full warranty. These sights have a precision machined metal body that hold the tritium gas filled lamps. The lamps glow bright green in the dark and have white outlines that show as white spots in the daylight. These sights are impervious to solvents and puncture. Hex wrench and screws included for assembly. Beretta Nano Tritium Night Sight Set EU00038