TruGlo Brite-Site TFX Tritium Night Sights glowing bright both day and night, TFX sights are always ready. TFX takes award-winning Tritium + Fiber-Optic technology even further with all the features requested by TruGlo customers: compact snag-free design, longer sight radius, and amazingly durable construction built to handle just about anything. Illuminating elements of these tritium pistol sights are encased inside a virtually indestructible chemical and shock-resistant capsule and the CNC-machined steel is protected with a rust-proof Fortress Finish. There is even a highly visible white ring surrounding the front fiber to make it even more visible, encouraging the eye to rapidly focus on the front sight for a fast and accurate sight picture.