The ARRMA NERO 6S BLX Monster Truck Aluminum Front Knuckle Arm by GPM MAN021 is constructed from 6061 T6 aluminium to enhance steering fidelity and increase component longevity compared with stock plastic knuckles. These arms are intended to minimise lateral play and deliver a more direct steering feel. The supplied delrin collars assist in maintaining smooth articulation while reducing concentrated load on the arm mounting hardware.