This is the Shimano Dura-Ace BR-9000 R55C4 Cartridge Brake Shoe and Fixing Bolt Set. This set includes shoes for one brake, with two included fixing bolts. These pads are slightly narrower to allow for wide carbon rims and are not to be used on alloy rims. Features: R55C4: High-end race brake pad with excellent wet and dry performance 1mm thinner profile for wider carbon rims Shimano Cartridge-type road brake pads fit models: Dura-Ace BR-9000, BR-9010, BR-7900, BR-7800, BR7700 Ultegra BR-6800, BR-6700, BR-6600, BR-6500 105 BR-5800, BR-5700, BR-5500 Non-Series BR-R600, BR-R561, BR-R560, BR-CX70 Specifications: Brake Type: Rim Brake Intended Brake Use: Road Caliper (Shimano/SRAM) Compound: Carbon Rim Compound Configuration: Pad Insert Only Pad Attachment Style: Cartridge Color: Black