These Cobra Racing knuckle set is "beefy" and ALL ALUMINUM.  Included in the set is two steering knuckels (L and R) + 2 C-Hubs (left and right) + 2 rear axle carrier (L + R).  This set is upgraded with a full set of ABEC5 oversized rubber sealed bearings for unmatched performance.  These knuckles look beautiful and are extremely durable (will never break on you).  Made of  strengthened T6 Aluminum (which is a similar material to the ones they use on airplanes, due to their light weight and durability).  

Two front C-Hubs

Two front Steering Knuckles / steering block

Two rear axle stub carriers

Full set of ABEC5 rubber sealed bearings for a complete bearing refresh.

All required hardware for proper installation

Traxxas Maxx / Traxxas WideMaxx (all versions)