Brembo's 4-pad HH compound was developed specifically for racing and designed to provide maximum performance. Four pads mean four leading edges of the pads, one for each piston, offering amazing initial bite. These come stock in the optional upgraded 4-pad calipers as shown below. Price is per side/one set (2 pads), add two (2) sets for both sides. NOT for M4 calipers, see Z04 Pads HERE.