Yokomo BD11 / BD12 Gear Differential Set 38T

Successor of the BD9 cone differential (YOK-B9-500GS).

The newer differential for the BD10, BD11 and BD12 differs from its predecessor as follows:

The O-rings are no longer black, but clear (colorless). Here the difference is only in the hardness. 

The more important change is the use of now 8, instead of 4 shim washers under the 4 small differential gears.  
According to Team Yokomo the differential works smoother and the load on the gears is reduced.

In general, both differentials (YOK-B9-500GS and YOK-B10-500GS) fit the Yokomo BD9, BD10, BD11, and BD12 models.