TRUGLO TFX Pro Tritium and Fiber Optic Xtreme Hangun Sights for FN Pistols Fully protected TFO technology encapsulated in a virtually indestructible configuration Impervious to oils, chemicals, cleaning solvents and ultra-sonic cleaning processes Provides great visibility in all shooting conditions Utilizes quality Swiss tritium for maximum brightness Front sight FOCUS-LOCK for fast and accurate shooting