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