This design is generally only used by technical divers for tech diving BCD. The design includes a metal backplate, harness and detachable air bladders surrounding the backplate.
There are two main types of air bladder wing types namely the horseshoe shape or the donut shape. Both types attach to the backplate and sit between the backplate and the air tank.The difference between a Horseshoe and a Donut style scuba wing is how the air travels through it. With a Donut, it is a completely enclosed tube so the air travels 360° around the Backplate while with a Horseshoe Wing there is a gap.
The backplate and wing types are probably the most stable design because the buoyancy is concentrated around the heaviest part of the dive equipment; the pressurized air tank. This makes the diver even more streamlined than with a Back Inflate.
