This is a package of Progressive Rate Shock Springs from Traxxas for use with the Traxxas Ultra Shocks set only. These may be used on either the front or rear of the T-Maxx 3.3 and other specified Traxxas R/C vehicles.
FEATURES: Steel construction; White in color
FUNCTION: Under light duty driving the progressive rate springs soak up small bumps.As the jumps get bigger these springs get firmer the more the suspension is compressed.