Swiss Tritium in the front sight Hermetically sealed TFX capsule Quickly acquire the proper sight alignment no matter what lighting conditions Have the convenience, confidence, and safety of TruGlo TFX Brite-Site sights in both day and night conditions. Quickly acquire the proper sight alignment no matter what lighting conditions. These sights are fully protected TFO technology in a hermetically sealed TFX capsule making them virtually indestructible. The TFX encapsulated Tritium Fiber Optic is a virtually indestructible configuration, that's impervious to oils chemicals, solvents, and ultrasonic cleaning. The glow in the dark Swiss Tritium capsule in the front sight features a white locking ring for enhanced visibility in low light conditions. These CNC machined snag resistant sights are protected with a FORTRESS finish for maximum protection. When you need a set of bight night sights for your carry pistol, get the toughest most advanced sights on the market, get TRUGLO TFX Brite-Sites!