The Formula R1/The One/Mega Alloy backed disc brake pads are identical to those that come stock in these brakes. The pads use an organic compound to maximize the already incredible modulation ability and minimize noise. At just 10g/set, the alloy backed version saves 13g per set over the alternative. The Formula R1/The One/Mega Alloy Backed Disc Brake Pad set includes pads and retraction spring for one caliper. Order two sets for a complete bike.