The SwissStop RacePro Yellow King brake pads feature brand new pad design with improved performance, smooth feel, better wet weather braking, and longer lifespan. The Yellow King compound is specifically made for carbon rims but also works well on aluminum braking surfaces. They are compatible with 2000 and newer Campagnolo® and Zero Gravity® brakes and have the void on the back for use with the 2011 11-speed systems that allow for the brake pad retention spring/clip.
The goal of SwissStop is to optimize the physical design and performance of the brake pad. They reached their goal though rigorous testing by several leading wheel manufacturers, professional riders and EN standards lab in Germany.