Made of hardened stainless steel to provide greater stability and smoother transmission while driving. | Universal joint style with higher load capacity and larger drive angle. | Spline coupling design with higher transmission torque and less deformation. | Enhanced structure design comes with stabler connection and movable brass beads which reduces the clearance, ensures less shaking. | Perfect as replacement for the stock plastic parts of Traxxas 1/18 TRX4M Bronco Defender RC Crawler.