Features of TriLux H3 Steyr Arms Manlicher MA1 3-Dot Front & Rear Nightsight Set ST-01 White Rings: All TriLux H3 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. TriLux H3 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 TriLux H3 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 Package Contents: TriLux H3 Steyr-Mannlicher M-A1 3 Dot Front & Rear Night Sight Set ST01 Learn More