Mast Filp is one new designed machine that with six stroke length options (2.6mm,2.9mm,3.2mm,3.5mm,3.8mm,4.0mm) for a wide variety of procedures, suit for all kinds of tattoo style lining, shading, color packing.The Internal structure of the machine allows artists to keep the Flip Pen bagged while making stroke length adjustments, ensuring uninterrupted and seamless tattooing. The ergonomically design helps to reduce hand fatigue during procedures, use Mast coreless motor that this machine continuous operation, Low noise, Long-lasting stability. For more colors please click??Gradient Red, Gradient Blue, and Gradient Purple. Specifications: Diameter:30mm Machine Length: 112mm Stroke Length: 2.6-4.0mm Five adjustable option: 2.6mm,2.9mm,3.2mm,3.5mm,3.8mm,4.0mm Motor: Mast Coreless motor Working Voltage: 5-12V The battery is not included.