This is the Shimano Dura-Ace BR-9000 R55C4 Cartidge Brake Shoe and Fixing Bolt Set. This set includes shoes for one brake, with two included fixing bolts.
Shimano R55C4 Road Brake Pads - Black - Cambria Bike
Bicycling Catalog - Bow Cycle, Calgary, AB
Parts - Bow Cycle, Calgary, AB
SHIMANO Dura-Ace, Ultegra, 105 R55C4 Brake Cartridges : : Sports & Outdoors
Bike Brakes, Levers, & Pads For Sale - Sweet Pete's Bike Shop Toronto
Bicycling Catalog - Trinity Bikes
Parts - BIKEALOT
Brakes/Levers/Pads - Tangletown Bike Shop, Minneapolis, MN
Brakes/Levers/Pads - The Bike Shoppe Ogden
Brakes/Levers/Pads - The Bike Crossing
Brakes/Levers/Pads - Planet Bike East Brunswick Matawan / Old Bridge
Brakes/Levers/Pads - Brant Cycle & Sport