Reynolds Cryo Blue Carbon Brake Pad Inserts Shimano/SramReynolds Cryo Blue Brake Pad Inserts are an excellent blend of composites, allowing your carbon braking surface to recover more quickly, stop securely and help prevent bowing or warping on long braking maneuvers. For Campagnolo or Shimano/SRAM brake caliper systems. Only carbon wheels with a carbon braking surface need apply. Will not work with an aluminum rim.847818012753