These are a limited edition small production run of optional low profile shock towers for the GZ1.  These towers allow you to use XRAY T4 or Yokomo SLFII shocks on your GZ1 for a lower CG Setting.  In conditions of particularly high grip we have found great gains in driveability, especially in spec classes with the shorter damper units.  While we do not believe these are an “essential” upgrade, we do feel that in certain conditions the car can be easier to push hard over a run vs. the standard length shocks.