This machine could be used both shading, lining, large area coloring Stroke Length:2.5-4.2mm. Ergonomic, lightweight. Designed for use with standard and cartridge needles This rotary machine have spring and armature bar set-up that ensure more Stable frequency, have stronger rebound. Re-engineered and Special frame for a smoother, quieter operation at a lower voltage without stalling ,Solid brass frame, coreless motor. Flexible Design, Comnination of motor machine and shrapnel machine. Specifications: Weight: 145g Frame: Solid Brass Stroke Length: 1-4mm Working Voltage: 4-12V Speed: 10V/10000Rpm Connection:RCA