This is an optional Team Associated RC10B74.2 Factory Team 2.5mm Carbon Fiber Chassis Brace Set (Stiff).
Includes both a front and rear carbon fiber chassis brace support in 2.5mm thickness.
This set will decrease chassis flex for high grip situations where that is desired.
These have been updated from the previous version to allow clearance for the rear gearbox on the RC10B74.2.