TruGlo's Brite-Site TFO fiber optic handgun sights has unmatched visibility in all shooting conditions. It utilizes quality Swiss tritium for maximum brightness and has a Fortress finish that provides a permanent protective coating for maximum protection. This model has green front and yellow rear. It is compatible with S&W M&P (including Shield and .22 models, excluding .22 Compact/C.O.R.E. models), SD9 and SD40 (excluding VE models).