TFO gun sights use the same proven technology as our TFO archery pins. These sights are the most revolutionary innovation since TRUGLO, Inc. introduced fiber-optics. TFO refers to our patented combination of Tritium and Fiber-Optic technologies. The Tritium maintains the brightness level of the sight in low-light or no light conditions. That means you can see your sight even in complete darkness, with perfect transition through all lighting conditions. Tritium does not need batteries and does not need to be charged with light... it simply glows.
Big Book Catalog, Issue:70, Page:300
SPECS: Fits - The folllowing Glock pistols: 17/17L, 19, 22, 23, 24, 26, 27, 33, 34, 35, 38, and 39. Tritium/fiber optic front sight, with plain black rear sight.Limited 12-Year Warranty. Due to gun manufacturers' machining tolerances, point of impact may differ slightly.