Size-specific aluminum platform pedal provides optimal shoe/pedal interface.

Optimal surface area
Minimal profile 16mm thin
10 adjustable 8mm pins per side for grip
10mm pins available for purchase here
Premium bearings & seal system
Stamp small recommended for shoe sizes: 5-10 (us) // 37-43 (eu)
Stamp large recommended for shoe sizes: 10-15 (us) // 43-49 (eu)
Serviceable, pedal refresh kit found here
Owners Manual and Technical Documents here