This is a pair of two optional Yokomo 15° Aluminum Front Steering Hub Carriers, with a Gun Metal anodize. These carriers are designed for the B-MAX4 series of 4WD Buggies, but they are also compatible with the YZ-4 4WD Buggy.
These carriers increase the rigidity around the steering and help improve front traction.
These Gun Metal Carriers are also available in 8° (YOKB4-413A8).
Yokomo also offers 10° and 12.5° aluminum carriers but in Black anodize with a chamfered edge:
