1) Double cylinder, high air flow 2) Oil free, piston type; No air polluted. 3) Double air pressure switch. Product Name: Double Cylinder Airbrush CompressorModel ... , can operate with many airbrushes.2) Oil free, piston type; No air polluted.3) With water filter, pressure adjustor and pressure gauge ... (cm): 68x39.5x26.5CertificateCE, GS, ROHS, ETL, CETL haosheng Mini Air Compressor AS19