Offering a wide choice of illuminated dot colors these Night Sights fromTrijicon will easily suit your individual shooter preferences. Trijicon Smith Wesson MP 3 Dot Front Rear Nightsights are designed and assembled with the optimum combination of strength and safety. The patented aluminum cylinder and sapphire lens construction cannot be equaled. The brightness obtained from the tritium content is focused through the sapphire lens to give the maximum possible illumination. Because the sight blades are machined from steel rather than cast their strength is unsurpassed. The Trijicon Night Sights for Smith & Wesson M&P Series are the brightest strongest and safest on the market. White Rings: All Trijicon Night Sights feature a white ring around the glowing dots for unequalled daylight visibility. Silicone Rubber Cushion: Gives additional shock-protection to tritium filled glass lamps within the aluminum housing. Trijicon Tritium Phosphor Lamp: Glass lamps filled with pressurized tritium gas glow bright green yellow or orange at night. The lamps are guaranteed to last 12 years (green or yellow lamps). Protective Aluminum Cylinders: Contains and protects the tritium gas filled lamps from heave recoil and harsh cleaning solvents. Sapphire Window: Each Trijicon Tritium Lamp is capped with a Sapphire Jewel which helps to evenly distribute the light from the tritium lamps as well as protect it from solvents and puncture.