They have the same part number all the way up to XTR:
Y41N98030 Steel Ball (3/32") 62 pcs.
If you just want to ride, the improvement above PD-A520/PD-M520 is nowhere near enough to justify the price. You might want posh pedals for aesthetic or weight weenie reasons, but functionally you'd be better off replacing cheap pedals more often.
Balls.
They have the same part number all the way up to XTR:
Y41N98030 Steel Ball (3/32") 62 pcs.
If you just want to ride, the improvement above PD-A520/PD-M520 is nowhere near enough to justify the price. You might want posh pedals for aesthetic or weight weenie reasons, but functionally you'd be better off replacing cheap pedals more often.