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RPM A-arms for the Traxxas Slash 4×4, Stampede 4×4 & Rustler 4×4 are everything you’ve come to expect from RPM, and more!RPM eliminated the slop in the suspension system, tightening the tolerances around the hinge pins, reduced the fore and aft movement of the A-arms at both the inner hinge pin and at the axle carriers by better than 90%, and improved the durability dramatically (they’re made by RPM, enough said). As a bonus, they cut 6.5 grams of weight off of each A-arm*! That’s a total loss of just under one ounce of weight simply by replacing your stock A-arms with the RPM versions!Don't forget about how much better aesthetically the RPM versions look either. RPM A-arms carry over a traditional look with 30 degree leading and trailing edges, and huge bosses for the shocks and sway bar mounts.RPM A-arms are molded in their trademark blend of incredibly durable nylons and are backed by an industry leading warranty. Designed, manufactured and produced in southern California, in the USA!Tech Notes: Replaces stock Traxxas #3655R & #3655X. RPM A-arms will not fit the newer Fiesta ST Rally. RPM arms are sold in sets of 1 – left and 1 – right A-arm in each package. Two packages will be needed to complete one truck. The upper hinge pin hole of the rear axle carriers cannot be used (not a stock location for these vehicles) due to strengthening designs that reduce the clearance around the rear axle.*Weight comparison based off of Traxxas #3655X.