Open binding mechanism, designed to better shed mud Low maintenance sealed bearing cartridge axle Pedal System:  SPD  SPD Cleat Surfaces:  both surfaces    Spindle Thread:  BC 9/16\" x 20 T.P.I.  Spindle Material:  chrome-moly  Cartridge Spindle:  yes  Cleat Retention Indicator:  yes  Cleat Retention Adjuster:  yes  Mud Shedding Design:  yes  Pedal Body Material:  aluminium / barrel finish  Reflector:  SM-PD22  Weight:  380g (pair)NOTE: Ignore the picture - this pedal is black!