Traxxas 4951X Long Heavy-Duty Half Shafts with Metal U-Joints (pair) Pair of heavy-duty long half shafts external-splined (2) & internal-splined (2) and metal u-joints (4) Replaces worn or damaged parts Use Traxxas stock and hop-up replacement parts to get the most out of you Traxxas RTR vehicles! This product is made from high quality materials, and designed for lasting performance. This is for use on RC vehicles such as the Traxxas T-Maxx, consult your user's manual for exact parts listings.