Glowing 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 our customers requested: compact snag-free design" longer sight radius" and amazingly 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-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. TFX™ sights will amaze even the most discriminant shooters.