RPM Lower Spring Cups for HPI Savage, Savage-X, E-Savage and Most Losi & Traxxas Shocks, BlackOur spring cups hold the base of the shock spring in place better than the stock parts and, because of our killer material, also tend to stay cleaner. In addition, coupled with the above mentioned spring clips, anyone can add a whole new dimension of color to their Savage or Savage X! Nothing looks better than a complete suspension set up dressed up with RPM colors! RPM spring cups are available in black, blue, yellow, or purple!