TRUGLO TFO Tritium and Fiber-Optic Handgun Sights for Kahr Arms Pistols, Green Rear (TG131AT1) UNMATCHED VISIBILITY in all shooting conditions, night or day; GLOWS IN THE DARKno batteries or light exposure required Available with YOUR CHOICE of GREEN OR YELLOW FIBER in rear sights; Yellow fibers in the rear sight increase contrast and aid in quickly focusing on the brighter green front sight Made of tough, CNC-machined steel with a FORTRESS FINISH COATING for maximum protection CONCEALED FIBER cannot be seen by target; SNAG RESISTANT DESIGN fits standard holsters Kahr Arms Models: K, MK, P, PM, T & TP Models with New Dovetail (produced after 2004)