These rod ends are tough! The area around the ball stud is thicker than the stock rod end while still allowing a full range of motion of the pivot ball. Additionally, the shank has been redesigned with a pair of flats, making the rod end much easier to work with (versus the stock, round shank). RPM rod ends are sold in sets of twelve to complete most vehicle needs.RPM Rod Ends cover a wide range of currently available Traxxas vehicles including all versions of the following: Slash 2wd, Slash 4×4, Summit, T-Maxx, E-Maxx, Revo, e-Revo, Slayer Pro 4×4, Stampede 4×4, Rustler VXL, Rustler 4×4, Jato and Bandit VXL.Tech Notes: RPM long rod ends replace Traxxas stock #5525. Sold without pivot balls. Stock Traxxas pivot balls are required for completion.