RPM s X Maxx A arms are designed to be the strongest lightest arms provided Starting with the upper A arm RPM used their proven A arm designs from past successful builds to create an upper support structure sure to handle anything you can throw at it The lower A arm has better ground clearance than stock A arms and has a cross section based off of the proven 1 5 scale HPI Baja A arms so you know they re tough RPM also created a double support beam on the lower arms to spread impact energy over a larger area meaning hard hits won t force you into the walk of shame They re also universal fit which means they ll fit on any corner of your truck No more worrying which arm fits where RPM X Maxx A arms are molded in their trademark blend of incredibly tough engineering grade nylons Features . X Maxx Upper Lower A Arm Spare Parts Set Compatibility . Traxxas X Maxx Specifications . Color Blue. Weight 0 264 lbs