This Front Upper Arm Adjustment Block Set offers a large range of tuning options for the front upper suspension of your ARRMA vehicleFeatures: Tough composite material for long-lasting durability during extreme RC action Precision manufactured for smooth suspension operation in all conditions Four pairs of active caster inserts offer four different mounting positions in the front shock tower Twelve eccentric upper arm inserts offer fine tuning of the front upper suspension camber and roll center Includes:8 x Active Caster Inserts 12 x Upper Arm InsertRequires:To be used in conjunction with #ARA320644, #ARA320654, #ARA330732