Stroke can be adjusted as per your requirement and style ( Stroke Options are 1.0MM,2.0MM ,2.6MM,3.0MM,3.6MM,4.0MM,4.8MM,5.0MM ) A Great Stable, Powerful, Vibration-free Tattoo Machine Designed for the long working hours Comes with 6 Month Repair Warranty from Company. Aircraft Aluminium Connection: 5.5 mm DC/Jack Plug Propulsion: Precision DC Motor Power Input: 15 V Switch Frequency: 55-165 Hz Rpm Range Stitches / Sec: 8V-8000rpm / min 8-800 / sec Running Volt: 6v Working volt: 7-12v Max Volt: 15v Fitted 8000 RMP Japanese Silent Motor