The New Dynamic Racing Concept from SBS combines the best of both worlds – the strong initial bite and linear in-stop performance from DS-1 and smooth initial bite and progressive in-stop performance from the new DS-2. This makes it possible to fit the DS-1 on the left side brake disc and the DS-2 on the right side to achieve a combination of different performance characteristics of the two compounds. These pads are sold 'per caliper' - if you have twin calipers on the front you will need to add two sets of the front pads to your basket.