White "Focus Lock" ring on front sight assists in low-light visibility and rapid target centering and acquisition. Black retention rings on rear sight improve front sight acquisition. The combination of “glow-in-the-dark” Swiss Tritium plus Fiber-Optic elements provides unmatched brightness in ALL conditions. TFO® technology provides 24-hour visibility -NO BATTERIES required. Hermetically sealed TFX™ capsule provides maximum protection of Tritium and Fiber-Optic elements from oils, chemicals and cleaning solvents. Green Front and Rear with White outline on Front