This is an optional Hot Bodies Aluminum 0.5° Two Piece Rear/Front Pivot Block Set, and is intended for use with the Hot Bodies TCXX 1/10 touring car. These provide extra flex on lower grip surfaces by allowing the front and rear end of the chassis to twist easier than a single piece design. These were used by Atsushi Hara to claim the TQ honors at the 2012 IFMAR World Championships.