With the Alexrims freehub body, you can quickly and easily upgrade your existing hub or wheel to Shimano HG Spline L (Road 12-/11-speed) – ideal for worn parts or upgrades. Specifications: Material: Aluminum Cassette compatibility: HG spline L (Road 12/11-speed) Wheel compatibility: Alexrims CXD4 (old type, 2016 and older) Freewheel type: 4-pawl freewheel Bearing: Industrial bearing, sealed Color: silver