The first and ONLY of it's kind - Fully protected TFO� technology encapsulated in a virtually indestructible configuration - Impervious to oils chemicals cleaning solvents and ultra-sonic cleaning processes - Unmatched visibility in all shooting conditions 24 / 7 - Utilizes quality Swiss tritium for maximum brightness - Glows in the dark - No batteries required - Concealed fiber can not be seen by target - FORTRESS FINISH provides a permanent protective coating for maximum protection - Snag resistant design - Fits standard holsters