So without a driver on the end(I assume that's what's missing from the left) that hub is 1.3lbs heavier than a BWR(1545g vs 950g) w/cassette driver,anti-turn washers,and nuts.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Brompton S6L/S2E-X/M6L-X/S12 T Line