Aztec HexVent Disc Brake Pads For Shimano Flat Mount Dura Ace / Ultegra / GRX 

High performance disc brake pads with patented hollow backplate heat control system

Heat transfer between the brake pad material and brake piston is reduced significantly, preventing brake fluid vaporisation

Increased surface area and air-cooling-channel dissipates heat efficiently, reducing brake fade during prolonged braking events

For Shimano Flat Mount Dura Ace / Ultegra / GRX