TruGlo TG13GL1A TFX Low Green/White Outline Fiber Optic/Tritium Front/Green Fiber Optic/Tritium Rear/Black Nitride Fortress Frame, Compatible w/Most Glock Except MOS, Front Post/Rear Dovetail MountGlowing bright both day and night, TFX sights are always ready. TFX takes our award winning Tritium + Fiber Optic technology even further with all the features compact snag free design, longer sight radius and durable construction built to handle just about anything. Illuminating elements are encased inside a virtually indestructible chemical and shock resistant capsule and the CNC machined steel is protected with a rust resistant Fortress finish.