1) Double cylinder, high air flow 2) Oil free, piston type; No air polluted. 3) Double air pressure switch. Product Name: Double ... Double cylinder, high air flow, can operate with many airbrushes.2) Oil free, piston type; No air polluted.3) With water ... for airbrush purpose.Switch 2, high pressure switch, for other high pressure air tools.5) It can start with air, continuous working, powerful ...