This is the Vented Shock Cap (1pc) For the Team Durango 1/8 4WD Off Road Buggies FEATURES: The vented shock cap allows air to move in and out of the area above the shock diaphragm. This offers more consistent damping, especially on long runs on rough terrain. INCLUDES: One shock cap COMMENTS: This shock cap should be used with the TD330301 Volume Compensation Foam (TDRC8370) which is placed above the diaphragm before installing the shock cap. This is an optional part for DNX408v2 1/8 Nitro 4WD Off Road Buggy DEX408 1/8 Electric 4WD Off Road Buggy (TDRC0300) 5/9/12 pjw ir/jxs