Black bag air system, black bags come in different designs depending on the application, load and space. They generally sit alongside the OE leaf spring or Torsion Bar. There are three types, Air Master Basic consisting of a pair of air bags, connecting air line and a Schrader Valve. Air Master Comfort type adds a compressor and gauges so you can inflate/deflate from the comfort of the drivers seat. The Air Master Automatic system is self-levelling meaning the vehicle rides at the same height whether laden or unladen.