Astral rotary cartridge tattoo machine are made specifically in perfectly balanced upright driven by Japan motor. Come with hard, medium and soft three extra plunger bar Interchangeable drive system. Connection: RCA Aircraft aluminum. Light weight ONLY at 2.6 OZ or 75g. Available in COMBO version for adjustable grips and VISE version for flex and fixed grips. -One year warranty for the machine. Recommended working voltage: For lining :The voltage should between 7V-8.5V For colour packing and shading : The voltage should between 6V-7.5V. The voltage should not exceed 9V as the maximum.