Dragonhawk cartridge tattoo machine precision dc motor, continuous operation, low noise, long-lasting stability, light weight, unibody. Compatible with all cartridge needles. This tattoo pen offers you a better user-experience. Rotate the tattoo machine grip to adjust the needle's depth. 9000 R minute, strong and powerful, available for shading and lining. Stable operation between 6-9v with dc cord connection.Specifications:weight: 135gstroke length: 3.5Mm.Needle protrusion: 0-4.5Mmspeed: 8v-8000rpmoperating voltage: 6-9 v