Genuine OEM MINI Crankshaft Pulley Vibration Damper, part number 11237638551. This component reduces engine vibrations and ensures smooth operation of the crankshaft. It is mounted on the front of the crankshaft. Constructed from a combination of metal and rubber for effective vibration damping. Genuine OEM vibration dampers are precisely balanced to prevent harmonic imbalance and ensure engine longevity.