The R1 Concepts Geo-Carbon drilled-and-slotted rotor for 2004–2011 Cadillac CTS (front left) is a single replacement rotor with a Geo-Carbon friction face and a drilled-and-slotted surface. The pattern of holes and slots assists heat control and pad cleaning, and the listing specifically identifies this unit as the front left rotor for the CTS years noted.
R1 04-11 Cadillac Cts Front Left Drilled & Slotted Geo-Carbon Rotor