The great thing about DT Swiss 350 hubs is that they have the same star ratchet engagement system as the much more expensive DT hubs. The system is basically two serrated washers. These are serrated in opposite directions. A bigger spring on the outside of each star ratchet pushes them together.
Each star ratchet has 18 teeth. That’s 18 points of contact (click for an exploded view). Most other hubs have a larger number of teeth for engagement but those teeth are only engaged in 3 points, or in some in cases only 2 points.