Size specific pro-level concave platform pedal provides optimal shoe/pedal interface. Optimal surface area Minimal profile 11mm-13mm thin Concave platform for secure foothold 10 adjustable pins per side for grip Premium bearings & seal system Grease port for easy maintenance Stamp Large recommended for shoe sizes: 10-15 (us) // 43-49 (eu) Stamp Small recommended for shoe sizes: 5-10 (us) // 37-43 (eu)