Differential drive ring for B-MAX2

JAN code:
639342106042
Item code:
B2-506
Maker price:
\440 JPY
Sale price:
\390 JPY
Manufacture:
YOKOMO
Weight:
7g
Categories:
YD-2 drive relationship
It is the differential drive ring.
Are large diameter than conventional. have also increased durability.
Input two.