TRIJICON Bright & Tough Green Night Sight Set For H&K P2000, P2000 SK (HK09). Tritium-filled glass lamp provides superior illumination in no light or low light conditions. 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. All Bright & Tough Night Sights feature a white ring around the glowing dots for daylight visibility. Contains and protects the tritium gas filled lamps from heavy recoil and harsh cleaning solvents. Each sight is manufactured to fit specific handgun makes and models. Gives additional shock protection to tritium filled glass lamps within the aluminum housing. Tritium lamp is warrantied to illuminate for 5 years on orange lamps, 12 years on green and yellow lamps from date of original manufacture. Our normal hours of operation are Monday through Friday 8am – 6pm CST. Gritr 7901 Boulevard 26, Suite 200 North Richland Hills, TX, 76180. We are open to the public. Dear Customer: After the Supreme Court’s ruling on South Dakota vs. Gritr is committed to compliance with these new regulations. If you have any questions about this new policy, please contact the Department of Revenue office in your state. We apologize for any inconvenience.