Trijicon Sights are machined from solid steel. The tritium gas-filled lamps feature 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. Some models also include a white outline for daytime visibility. The gas-filled lamps are silicone cushioned to take years of use and come with a full warranty. Matte.