This is a pair of GTR Composite Shocks without Springs for the Traxxas Jato.<br><li>Factory assembled for front installation on the Jato (1.4 mm piston) for rear use the installed pistons must be replaced with included 1.3 mm rear pistons.<li>Includes  Two GTR Composite Shocks bottle of silicone shock oil two 1.3mm pistons and instruction sheet.<li>Requires  Springs (TRAC7427-TRAC7434) depending on desired stiffness.<li>Length  3 .<li>Diameter  0.61  main body.