TruGlo Brite Site Series TFO TG. They us the patented TFO technology. They have a unbelievable transition through all light conditions. They glow in the dark. Are CNC machined steel construction. The concealed fiber cannot be seen by the target. Fits standard holsters and has a snag-resistant design Specifications for TruGlo Brite Site Series TFO TG131KTY: Manufacturer: TruGlo Gun Make: Kimber Color: Black Front Sight Color: Green Rear Sight Color: Yellow Fabric/Material: Steel Front Material: Tritium/Fiber Optic Country of Origin: USA Package Contents: TruGlo Brite Site Series TFO TG131KTY The TruGlo Brite Site Series TFO TG131KTY is a quality addition to the TruGlo lineup. For more great deals on Tritium Pistol Sights by TruGlo please browse our TruGlo Gun Parts page. TruGlo TG-TG131KTY: Brite Site Series TFO