This is an optional Kyosho Titanium Ball Differential Shaft, and is intended for use with the optional Kyosho ball differential set (KYOMZW206) for the Mini-Z MR-01, MR-015, MR-02 and MR-03 chassis.
This titanium shaft will help to reduce the rotating mass in the drivetrain improving acceleration, while at the same time reducing un-sprung weight in the rear pod helping to improve handling. 
 
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