These are Shimano stock replacement cleats for all Shimano SPD-SL pedals.  

-Yellow SPD-SL cleats have 6 degrees of float (3 degrees in each direction) for free movement and less joint stress, ideal for casual and performance riders alike.  Yellow's float pivot point is the center of the cleat, allowing the toes to point in a wide range of angles. Yellow is the most popular among casual fitness cyclists but are used by a wide range of athletes and the large float range provides for more room for error when setting up cleats.

-Blue SPD-SL cleats have 2 degrees of float (1 in each direction) allowing for a small range of movement while still delivering a high amount of pedaling efficiency.  Blue cleats have a float point that is at the front of the cleat, eliminating lateral sliding movement while allowing a small amount of angle change from the pivot point back towards the heel.

-Red SPD-SL cleats have 0 Degrees of float and are 100% fixed in position
Great for sprinters, professional athletes or people who value the most efficient power transfer possible and are not prone to knee pain
Note: Red SPD-SL cleats require that you know your optimal cleat position precisely, and you are comfortable adjusting your cleats into that perfect position

Regularly replacing cleats if you ride often will maintain proper foot stability and help keep knees pain free.  

Have a Peloton?  These are not the cleats you seek!  Stock Peloton uses Look Delta Cleats.