Traxxas option driveshaft has outside U-joint that is lubricated and sealed by a rubber boot to protect it from dirt and grime. U-joint pins are held captive by the ball bearings so you never have to worry about losing a pin. Traxxas metal CV shafts do not require you to limit your suspension travel. These shafts are only for the older e-mix with the short chassis where the shafts are the same length.
Length: 3.5" (89mm)
I went to metal drive shafts I kept destroying the plastic, so far, no problems.