RPM Shock Shaft Guards Black (4) Traxxas Ultra, Big Bore - 80402RPM Shock Shaft Guards for Traxxas 1 10th Scale Shocks Black Quick Notes: Fits Traxxas 1 10 scale Ultra and ? Big Bore? shocks Rocks, dirt and debris striking shock shafts lead to dents, dings and burrs, which in turn, leads to torn shock seals. Torn shock seals means leaky shocks and poor shock performance. RPM Shock Shaft Guards shield the shock shaft from those deteriorating elements, prolonging the life of the shock shaft, which improves the long