2 Models avalable; both models have dual sealed ball bearings having double row ballsand drum brake included. Kit comes with choice of 44T, 48T or 56T chain wheelsprocketModel 1: with freewheel for attaching chain sprocket; this model is used for pullstart engines; can be used for 2-cycle or 4-cycle non pedal start engine applicationsModel 2: made for pedal start engine applications where a solid flange hub is requiredfor sprocket attach; other wise same as model 1Packed on steel frame skid, suitable for double stacking producing area:China payment:T/T