 In 1977, the Steelers switched facemask colors from gray to black.Another feature of the helmet is that a player's uniform number appears on both the front and back (the Steelers are one of only two teams in the NFL to do so, with the other team being the New York Giants).Just like the Giants, the Steelers have the two digit helmet numbers located to the left and right of the center stripe on both the front and back of the helmets.