They created the original TFO(R) day / night sight, then made it virtually indestructible with their hermetically-sealed TFX(TM) sights. Now, they are taking TFX(TM) 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. Features : Contrasting colored front sight ring for even faster focus Quick and accurate U-notch Design Angled rear sight edge for emergency one-hand operation