. Polyurethane rubber heel pads add grip, traction and comfort when walking in your Sidi road shoes . Compatible with Sidi Millennium III, Carbon Composite and Carbon Lite soles . Compatible with some older shoe models - the small stabilizer bumps on the back of the heel pad will need to be removed, because the soles do not have corresponding holes for them to fit into . Includes two replacement heel pads and two mounting screws