CNC machined in our British Columbia, Canada manufacturing facility. * Outer, middle & aluminum inner rings manufactured from 7075-T6, one of the strongest alloys available today. * Outer rings are made from 4mm thick material & middle rings from 5mm thick material for unsurpassed durability. * Rings feature our patented S.H.I.F.T. technology, featuring hardwearing steel S.H.I.F.T. chips for dual action up-shifts.