Aluminum Shock Upgrade Kit (2) for Traxxas UDRHot Racing optional aluminum shock upgrade kit for the 1 7 TRA UDR including bleeder caps, and rod end. COMMENTS: Shocks can be setup as bladder shocks by using the stock bladders (included o rings not used) or as emulsion shocks by using the included o rings (bladders not used) Includes: Two (2) aluminum bleeder shock caps Two (2) shock cap o rings (used to setup shocks as emulsion shocks see comments below) Two (2) ball end with o ring and ball