The SwissStop Flash Pro Yellow King compound feature a high performance compound for carbon wheels but can be used on aluminum rims too. They are design for excellent stopping power wet and dry with superior modulation and low pad wear rates. SwissStop uses decades of materials experience combined with rider feedback to produce the best pads possible. They are race proven with victories at the Olympic Games, World Championships, and many other professional races. SwissStop brake pads are a popular upgrade and fit Shimano and Sram cartridge brake pad holders.