TFO pairs our fiber-optic sights with our tritium night sights to create a consistently bright sight picture day or night. Our patented combination of tritium and fiber-optic technologies unites the best of both worlds - providing the same bright sight picture whether you are in glaring daylight or complete darkness. Features: The first of it's kind Unmatched visibility in all shooting conditions 24/7 Assembled in USA with quality swiss tritium for maximum brightness Glows in the dark No batteries required Concealed fiber cannot be seen by target Fortress finish provides a permanent protective coating for maximum protection Snag-resistant design/fits standard holsters Patented Smooth rear sight profile