This JBL VTX - B28 - GND Outrigger System is for those who need to set up ground stacks of speakers. Musicians, event organizers, and sound engineers will find it useful. It improves stability in ground stack configurations built on the VTX B28 subwoofer. Connects directly to the B28's integral rigging hardware. Has a simple two - part design that's compact and lightweight, fitting into most standard road cases. The dimensions are 41 mm x 60 mm x 550 mm (1.6 in x 2.4 in x 37.4 in) and it weighs 3.7 kg (8.3 lbs). It's made of high - grade steel with an anti - corrosion coating and a black powder coat finish.