TruGlo TG131NT2 TFO Day/Night Sight Set

WHAT IS TFO?? TFO gun sights are the most revolutionary innovation since TruGlo introduced fiber optics. TFO refers to our patented combination of Tritium and Fiber Optic technologies. The Tritium maintains the brightness level of the sight in low light or No Light conditions. That means you can see your sights even in complete darkness with perfect transition through all lighting conditions. Tritium does not need batteriesand does not need to be charged with light - it simply glows!!!