This is an optional Traxxas Mini Maxx/XRT Aluminum Caster Blocks in Blue.
Traxxas aluminum caster blocks (C-hubs) improve the appearance, ruggedness, and control. Their 6061-T6 aluminum construction adds strength and precision to your vehicle with a brilliant anodized finish. Genuine Traxxas accessories are made by Traxxas, for Traxxas, to guarantee a perfect factory fit every time.
