Glow-in-the-dark photoluminescent paint aids visibility and quicker target acquisition in transitional light; Angled and serrated surface to reduce glare, and black painted rings to enhance focus on front sight; Specifically designed rear notch enhances front sight acquisition; Protective Clear Coat - Specifically designed rear notch enhances front sight acquisition; Tritium-filled glass lamp provides superior illumination in no light or low light settings; Protective Aluminum Cylinders - Contains and protects the tritium gas filled lamps from heavy 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 lamp as well as protect it from solvents and puncture; Each sight is manufactured to fit specific handgun makes and models; Silicone Rubber Cusion - Gives additional shock-protection to tritium-filled glass lamps within the aluminum housing; Tritium lamp is warrantied to illuminate for 12 years from date of original manufacture