AMP’s high-performance Organic Carbon Backed Disc Brake Pads for Shimano Dura-Ace/Ultegra offer squeal-free riding and excellent retardation. The carbon backplate has much lower heat conductivity than either steel or aluminium, preventing the heat build-up from affecting the pistons and brake fluid so that power remains consistent and fade-free for the entire descent. AMP also claims that their pads are up to 25% lighter than pads with more traditional construction. Please see image for compatibility chart.