chris king 1

With a 12mm one-piece axle, the hub weighs a respectable 336g. For comparison, a similar Shimano Saint hub weighs 525g and a DT 440 395g, so it’s certainly light for the intended usage. Extra ruggedness can be had with a stainless steel freehub replacing the stock aluminium item.

chris king 2 has got all the information and more details.