BLACK. HB155M.580. Hawk's Black compound offers lower torque coeffiecients than the Blue compound, but provides better pedal modulation. Recommended for medium-duty race applications (tracks without severe braking areas). Excellent for dirt tracks. Also may be used for Solo II/Autocross applications. Can be used for rear pads in conjunction with higher coefficient front pads to alter brake bias or reduce rear lockups. Optimal temperature range 300F-800F. Fits 1986-95 RX-7 with hard suspension/4-piston front calipers.