Hub for shimano 11s cassette VITTORIA brand

Hub for shimano 11s cassette, VITTORIA brand, I have 4 types:

 VTKR: 166gram/ 4 fish/ CRMO steel
VCAR/VENR/VDNR: 4 fish/ CRMO steel
VA7R: 98gram: 3 fish/ aluminum
Va5R: 98gram/ 3 fish/ aluminum

In the context of bicycles, a hub is the central part of a wheel, where the axle is attached. It plays an important role in helping the wheel rotate smoothly and stably, and connecting the wheel to other parts such as the cassette (rear wheel) and the braking system.
Simply put, the hub is the "heart" of a bicycle wheel, helping the wheel operate efficiently and smoothly.