Adds non-rotating mass to the rear axle housing for adjusting weight distribution and lowering center of gravity.

Weight is: 52g

Replaces the caps on the ends of the Vanquish Products axles listed below:

VS4-10 D44 Rear Axle

SCX10-II F9 Rear Axle (non-portal)

SCX10-II RockJock Rear Axle

VS4-10 F9 Rear Axle (non-portal)