The tattoo machine cartridge pen is made from superior aluminum alloy, high hardness and lightweight. Exquisite workmanship, it is not hot after long time work. Using the latest ten slot eccentric wheel to ensure the long service life.Ergonomic pen handle is comfortable and easy to grip.well-rounded rotary tattoo machine designed for utmost accuracy and control. Emulating the grip and feel of an actual pen.Cartridge Tattoo Machine Pen precision DC motor, continuous operation, Low noise, Long-lasting stability, unibody. Compatible with all cartridge needles. Product voltage: 5-13 V DC, Rpm range Stitches / Sec: 8V-8000rpm / min 8-800 / sec.Weight: 127g( 0.30lbs). Stroke: 3.5mm. 0-4.5mm adjustable needle depth. DC connection.