Relic Revolve Front Hub material: 6061-T6 aluminum hub shell | 4130 chromoly axle | chromoly driver | 3/8 inch heat-treated chromoly axle bolts with 17mm wrench flats and a 6mm hex slot style: Sealed Female Front Hub axle size: female axle with 10mm axle bolts spoke holes: 36H bearings: sealed bearings color: polished additional information: Comes with alloy cones with steel core to prevent the bearings from deformating