PointZero Dual-Action 4-Color Changing Airbrush Set w/MAC Valve - 3 Tip Set (.3mm .5mm .8mm) Multipurpose use Precision-crafted body provides a balanced feel in the hand Micro Air Control (MAC) Valve for on-the-fly air pressure adjustment Quickly switch between 4 different colors Includes 7 exclusive downloadable e-Book airbrushing guides.