the exploded view in the back of the instruction manual has all the parts listed with part numbers,
the sdw comes with part number BB-1060P which would be the "SUPER PRECISON BEARING"
off the yokomo site they list the ceramic bearing as BB-106C
the standard bearing is BB-106
and just for info sake, they have a teflon bearing BB-106T
these were all numbers for the axle bearings. 6x10. some had a 2 or a 4 after them for 2 pack or 4 pack.
but with all that said, they also list the part number for the diff gears as the standard plastic gear. and i swear mine look more like the graphite gears then the plastic ones.
and having just pulled ceramic bearing out of a cgm for the sdw and putting the sdw bearings in the cgm i can tell you the sdw is free-er rolling.
so i guess what i;m saying is