Shimano makes three different cleats to fit their three-bolt SPD-SL performance road pedals, all with differing degrees of float.

Red cleats (SH10) have 0º, yellow (SH11) have 6º and blue (SH12) have 2º.

You'll know when it's time to replace them when the colored wear-indicator tips are worn out, or when that silky-smooth clipping in-and-out motion gets a little rough.