Trijicon 3 Dot Front and Rear Night Sight Set for Ruger SR9/9C/40/40C WHITE RINGS: Bright & Tough Night Sights feature a white ring around the glowing dots for daylight visibility TRITIUM-PHOSPHOR LAMP: Tritium-filled glass lamp provides superior illumination in no light or low light settings SAPPHIRE WINDOW: Each Trijicon tritium lamp is capped with a sapphire jewel which helps to evenly distribute the light from the tritium lamp as well as protect it from solvents and puncture PROTECTIVE ALUMINUM CYLINDERS: Contains and protects the tritium gas filled lamps from heavy recoil and harsh cleaning solvents FITS: Ruger SR9, SR9c, SR40, SR40c and SR45 models