The GPM MAS056 rear lower arms for ARRMA SENTON 6S BLX are engineered from 6061 T6 aluminium to provide a firmer rear suspension platform and consistent pivot geometry. Delrin collars are fitted to maintain tight tolerances at the mounting points and reduce lateral play. Multiple preset holes allow precise adjustment of damper angles to refine roll and traction. The hollowed arm profile balances reduced mass with reinforced structural areas for reliable service life.