J's racing slitted front brake rotor set includes both the front left and front right brake rotor for your selected vehicle. The disc is made from FC250 with copper,nickel and molybdenum additives that is then heat treated for extra strength. The carbon content strengthens the bond between the molecules while the heat treatment improves strain and crack resistance. The strength of the disc is important but so is stopping power which is why these discs have a slotted design to decrease braking distance.