TRUGLO Tritium Handgun Glow-in-the-Dark Night Sights for Ruger Pistols UNMATCHED VISIBILITY in low light shooting conditions or complete darkness; GLOWS IN THE DARKno batteries or light exposure required At night, sights are GLOWING GREEN DOTS; In daylight, sights are standard BRIGHT WHITE DOTS Made of tough, CNC-machined steel with a FORTRESS FINISH COATING for maximum protection SNAG RESISTANT DESIGN fits standard holsters; SQUARE-NOTCH DESIGN is duty proven MACHINED AND ASSEMBLED IN THE USA with quality Swiss Tritium for maximum brightness; 12-YEAR LIMITED WARRANTY; Patented