TRUGLO TFX PRO Handgun Sights combine a sealed TFX capsule (Swiss tritium plus fiber-optic) to provide maintenance-free, 24/7 day and night visibility without batteries. The patented shock-resistant TFX capsule and concealed fiber-optic elements are CNC-machined into an alloy-steel body finished with TRUGLO's FORTRESS protective coating, providing resistance to oils, chemicals, cleaning solvents and ultrasonic cleaning. The compact, snag-free design with a high-contrast focus-lock front ring (orange or contrasting ring as featured on model sets) supports fast target acquisition, while angled rear edges on some sets aid emergency one-hand operation. TFX PRO sets are offered for a wide range of handgun models and mounting styles; included items vary by model (some sets include installation components). Designed for tactical, hunting and self-defense applications; each set ships as a sight set with limited warranty.