Glowing bright both day and night, TFX Pro sights are always ready. TFX Pro takes the award-winning Tritium + Fiber-Optic technology even further with all the features 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-resistant FORTRESS FINISH.