This is an optional Team Associated RC10B5M "C" Factory Team Brass Arm Mount. This brass mount adds 20 grams of ballast weight, while adding additional strength. Part# 91523
- Added Strength and Adjustment
- Replaceable inserts
- Polished brass
- 20g ballast weight, laser etched
- Lower center of gravity
NOTE: Aluminum "C" Arm Mount Inserts (ASC91385) are not included and must be purchased separately.