GT XS Tattoo Pen This machine is compatible with all makes of cartridge needles on the market today, Hand assembled and made from aircraft grade aluminium also CNC machined. Motor and Max RPM - 12V Japanese Motor & 11,000RPM Suggested Voltage Setting - 5V to 7V Needle Stroke - 0 to 3.5mm adjustable stroke. Grip Handle - This pen includes 2 grip handles: 1.25" Grip & Tapered 3/4" Grip. Machine Connection - RCA Connection. Pen Power Cord - RCA Cord included. Accessories - Pen Holder, Discs, O-Rings, Springs & Tools. Weight and Length - 6.1oz and 4.6 inch Warranty - 1 year warranty through the manufacture. (does not cover damage to motor from ink blow black)