Aided by the release of the F-05 Front Multi-Roller Unit (15808), DR-EVO Multi-Mount back Body (15341) and DR 11mm Aluminum Passing Roller w/ integrated Ball Bearing (15342) how many ball bearing associated option parts for Dangun Racers have actually increased rapidly. In order to provide more ball bearing options, Tamiya now releases 2 kinds of ball bearings particularly for Dangun Racers. Each set comes with 2 bearings.