This is an optional Mugen Seiki 1.5mm Trailing Front Hub Carrier Set that can be used with CVA (MUGE0221 and MUGE0224) and universal driveshaft on all the MBX7 family of buggies, trucks, and GT vehicles. Package includes one left and right side, as well as four inserts. These uprights have more aggressive steering compared to the non- trailing front uprights and work great on smaller tracks.