3 unique platform sizes designed for optimal pedal to shoe interface - Small: 90 mm x 105 mm (Fits Mens 6 and under) - Medium: 100 mm x 105 mm (Fits Mens 7 - 10.5) - Large: 110 mm x 105 mm (Fits Mens 11 and above) Extruded micro grain refined (MGR) alloy platform with CNC optimize profiling Shot-peen surface and anodized for enhanced durability Cold forged chromoly steel axle delivers added strength and durability Industrial sealed bearings with IGUS bushings 16/12 mm concave plaform profile 20 pre-assembled steel pins / pedal