The PAH-H18 airbrush holder can hold up to 8 airbrushes (six airbrushes around and two in the center). At the bottom are seven air valve connections, one to connect up to a compressor and the other six can be used to hook up to airbrushes. This allows the user to run six airbrushes from just one compressor without having to keep changing hoses. Ideal when using different colours and different types of airbrushes!