Truglo created the original TFO day / night sight then made it virtually indestructible with our hermetically-sealed TFX? sights. Now they are taking TFX? technology to the next level for professionals and shooters who demand maximum performance from their handguns - providing ultimate reliability accuracy and brightness no matter how tough things get. Contrasting colored front sight ring for even faster focusTritium vial glows constantly - Fiber-optic gathers and directs surround ambient lightAll features of the Truglo popular TFX Handgun sightsPatented