The SH-12 cleats are original equipment replacement cleats on the Dura-Ace pedals and will work for all of the newer style, three-hole SPD-SL series pedals from Shimano. They are sold in pairs and includes all of the mounting hardware and screws needed for one pair of pedals/shoes.
Shimano offers three options for their SPD-SL cleats. The yellow color indicates that they offer 6 degrees of float, the red color indicates that they are fixed with no float and the Blue color indicates 2 degrees of float. SH-12 blue cleats have received refinement from working with the pros. They feature a slight 2 degrees of float with a front pivot center for a higher quality float. The Yellow cleats provide 6 degrees of float and are the standard cleat that originally come with Shimano pedals. Super wide platform with pontoon grippers make them easy to walk in and provide a nice big platform.