The Enzo V4 Pen has a large 1"inch grip and shorter size body. This make the pen easy to use and great balance and handling. This pen has a 3.6mm stroke and is fully adjustable. Great for lining and shading. This machine is powerful enough to handle any needles size. From 3 Liners to even 27 Magnums this machine can handle any needle type. Works with all standard cartridges. Includes an RCA Cord as well. Brand: Enzo Version 4 Pen Height: 3.5" inch tall Grip Width: 1" inch wide Pen Weight: 3.9 oz Operating Voltage: 6 – 7.5V Cartridge Comparability: Works with all standard cartridges. (excluding Nuto cartridges) Needle Stroke: 3.6mm swing and can be shortened with a simple twist of the grip. Connection: RCA Cord (Included) Motor: Performance motor (8,000 RPM) Warranty: 3-Month Warranty.