RPM 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 favorite Traxxas or Losi vehicle! These lower spring cups also fit the Associated MGT. Nothing looks better than a complete suspension set-up dressed up with RPM team colors! RPM spring cups are available in Bold Black, Blue.