Cartridge: complete set with standard compound pads, mounting bolts and washers. Inserts: Dura-Ace packaging fits all Shimano road models. Features: Performs well in dry conditions and tends to be low noise. Highly Resistant to wear in rainy conditions All cartridges fit BR7800,7700,6600,6500,R600,5600,5500, and 5501 R55C2 compound performs well in dry conditions, tends to be low noise, highly resistant to wear in rainy conditions R55C+1 shoe thickness is 1mm thicker than R55C R55C compound performs well in dry conditions and tends to be low noise, wears in rainy conditions