Two 3 pound rubber barrels on one long base, 6 pounds total, and that second drum is the whole point: coarse grind runs in one barrel while polish runs in the other, with no risk of stray 80 grit ruining a finish. The base measures roughly 6.25 by 16 inches and the whole machine weighs about 10 pounds. Each drum has an interior close to 3.9 inches across and 4.1 inches deep, so long stones need sorting.
Dual barrel owners in rockhounding clubs tend to name the 33B when asked what to buy after outgrowing a single barrel, and dealer prices have hovered in the mid 100 dollar range for years. Downsides are practical: it hogs shelf space, both barrels always spin together at one fixed speed, and two loads of slurry mean twice the cleanup at every stage change.
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