Uses Truglo patented T.F.O. technology. Unbelievable transition through all light conditions. Glows in the dark. Uses the best tritium available. CNC machined steel construction. Green front and rear. Concealed fiber cannot be seen by target. Fits standard holsters. Snag resistant design. When you need to make a fast and accurate shot brightness counts. Truffle brought fiber-optics to the shooting sports industry years ago for this very reason. They have now paired them with their Truglo tritium night sights to create a consistently bright sight picture?day or night! Truglo patented combination of Tritium and Fiber-optic technologies unites the best of both worlds. Whether you are in glaring daylight or complete darkness you can count on TFO to provide a bright and reliable sight picture. Uses Truglo patented TFO technology The ultimate handgun sight Unbelievable transition through all light conditions Glows in the dark No batteries required CNC-machined steel construction Concealed fiber cannot be seen by target Fits standard holsters Snag-resistant design