The Iwata Revolution M Series features a single-action style trigger for simple operation. It is a gravity-fed, internal-mix design for superior spray results. The M Series airbrush is perfect for airbrush cosmetics, body art, hobbies, models and general applications. The Iwata HP-M1 i has a .3mm needle/nozzle, a 1.5ml cup and is designed to work well with low pressure. With this simple airbrush you press the trigger to spray and paint flow is adjusted by turning the knob on the back of the airbrush.