The trigger will control the air and the amount of paint that comes out is determined by the needle adjustment on the back of the airbrush handle. Dual action is when the trigger on the airbrush controls both the air and paint. The trigger is pressed down for the air and back for the paint. Now when it comes to the feed on the airbrush there are three types of feeds that you can choose from. You can take airbrushing and create a beautiful mural on a concrete wall to turn that once bland wall into a work of art worthy of some attention. While you can do this by hand the time factor makes airbrushing a better choice. Airbrush art can also be applied to the body to create temporary tattoos and thus uses the human body as a canvas for an artist's imagination. In their starter kit they include 2 single action ABA airbrushes, 2 hoses, 9 glass airbrush bottles, a 2 outlet air manifold, 7 60ml airbrush tattoo ink in red, blue ,white, yellow violet, fuchsia and green and the kit includes a 120ml of black airbrush tattoo ink. The starter kit also give you 50 Vynalaser stencils that can be reused over and over again. The images they create are just a vast as the surfaces that they are airbrushing them on. This is why airbrush art fits for just about everyone around. Classic paintings can be airbrushed onto canvas to give for great wall art. With airbrushing the paint goes on to the canvas more evenly than if it had been hand painted. The other way is that you can freehand the design onto your project without the use of stencils or masks. Most stencils and masks that you purchase are reusable. The stencils are made from different material depending on what the stencil will be used for. But no matter what material your stencils are made from they all have to things in common. Being able to do micro airbrushing will allow for the artist to create a more realistic and more in depth detail on all small areas of their airbrush design. It is in these small areas that a lot of artist miss the chance to really define the details because they are unable to fully create the detailed area.