Size specific magnesium platform pedal provides optimal shoe/pedal interface. Details - Magnesium pedal body for weight reduction - Optimal surface area - Minimal body profile - 16mm thin - Concave pin profile & 10 adjustable pins per side for grip - 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 Specs - Adjustable pins: 10 per side - Body material: AM60B Magnesium Alloy - Endcap: T15 - Footprint: 114mm x 111mm - Inner bearing type: Igus Bearing - Max rider weight: No restriction - Outer bearing type: Double Cartridge Bearing - Shoe size: US 10-15 // EU 43-49 - Spindle material: Forged SCM 415 Chromoly Steel - Warranty: 5 years - Weight: 386g per pair