This is the Shimano Dura-Ace BR-9000 R55C4 Cartridge Brake Pad Inserts. These pads are for carbon rims and are not to be used on alloy rims. Features: R55C4: High-end race brake pad with excellent wet and dry performance 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