For use on the E-Rustler, Stampede, Monster Jam, and Slash;Tech Note: These A-arms will not work on the nitro versions of the Rustler & Stampede.;Serious strength and rigidity while the chemical make up of our proprietary blend of nylons provides unmatched durability;Backed by RPM's world-renowned breakage warranty;RPM is a proud American manufacturer designing and manufacturing 100% of our molded products right here in the USA!