RPM rod ends have oversized hexes and are molded to the strictest of tolerances from a proprietary blend of tough, bulletproof nylons. If you’re tired of popping ball cups and breaking rod ends, RPM rod ends are the solution! RPM rod ends fit all Associated, Losi, & HPI ball-studs. Like all of our products, RPM rod ends are guaranteed not to break! Available in Bold Black, Dyeable White, Yellow, Blue, & Purple!