This machine has been optimized to run even smoother, consistent and long-lasting. Exquisite design to give you the closest feeling to the actual pen, smooth, soft, and quiet operation ideal healing results. Needles depth locator more precise on stroke length adjust. Pure copper clip cord more durable. Random color will be shipped if the one you choose is sold out. Compatible with all the Dragonhawk cartridge needles.Specifications: Weight: 150g Machine Diameter: 32mm Machine Length: 95mm Stroke Length: 3.0mm Working Voltage: 6-8V Speed: 8V/11000RpmPacking includes: 1* machine with RCA clip cord