With the release of the F-05 Front Multi-Roller device (15808), DR-EVO Multi-Mount back Body (15341) and DR 11mm Aluminum Passing Roller w/ Built-In Ball Bearing (15342) how many ball bearing related option parts for Dangun Racers have actually increased rapidly. To be able to offer more ball bearing options, Tamiya now releases 2 forms of ball bearings specifically for Dangun Racers. Each set includes 2 bearings.