With the release of the F-05 Front Multi-Roller Unit (15808), DR-EVO Multi-Mount Rear Body (15341) and DR 11mm Aluminum Passing Roller w/ Built-In Ball Bearing (15342) the number of ball bearing related option parts for Dangun Racers have increased rapidly. In order to provide more ball bearing options, Tamiya now releases 2 types of ball bearings especially for Dangun Racers. Each set comes with 2 bearings.