This is the Yokomo R12 C3.1 Competition 1/12 Pan Car Kit. The latest iteration of the 4-time JMRCA Japanese National Champion and 2-time IFMAR World Champion R12 platform is back with the R12 C3.1 chassis.
Building on the success of the R12 platform, the C3.1 uses Rear Friction Tube Dampers which consists of small-sized lightweight plastic-molded tube dampers (as is used in the front damper), which reduces roll and improves agility of the car. The dampers provide an advantage on carpet by preventing excessive rear roll to improve handlings on high-speed turns. On asphalt surfaces, rear grip can be improved by using thicker damper oil. The front end of the R12 C3.1 inherits the fully-adjustable double wishbone suspension and friction dampers from previous generations of the race winning R12 series.  
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