The gamut dual was designed using the same proven approach as gamut39s single ring set ups the boomerangs are machined from aluminium for a clean light weight profile and utilize our impact absorbing p20 95mm polycarbonate bash guard like all gamut guides the dual ring guides do not require the use of any adapters featuring easy secure setup coupled with a micro adjustable roller which makes optimizing your chain line easy gamut duals weigh in at 150g bb mount with bash guard