This is a pack of four optional CSI Aluminum shock spring cups, intended for use with Mugen 1/8 scale vehicles. CSI shock spring cups are CNC machined from high quality aluminum and lightened to provide the lowest CG possible at the rod end. Additionally, they have been engineered so that the spring will clip over the end of the cup retainer helping to prevent the spring from coming off, which can negatively effect your race cars performance and handling.
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