StopTech Sport Rotors are 1-piece direct replacement brake discs for factory brake systems and stock calipers. These drilled and slotted rotors provide improved cooling, better bite, and refreshed pad surfaces for consistent braking performance. The specialized e-coating finish protects the cooling vanes and center hubs from corrosion. This specific part (127.39035L) is the Front Left side rotor. For a complete axle set, it is recommended to pair with the Front Right rotor (127.39035R). Features: Drilled and Slotted surface, high-carbon metallurgy, and superior resistance to thermal cracking.