These are CNC-machined hardcoated duraluminum rear wheel hex hubs. Ultra-true, direct, wobble-free wheel mounting ensures slop-free" wheel rotation. Wheel axles have been strategically lightened to reduce rotating mass without compromising strength. Set of two. Included as standard in XRAY T1 Factory Kit.
Part number 305315 is an upgrade spring steel option part that we would highly recommend on at least the front of the car.