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: 135g Stroke Length: 3.5mm. Needle Protrusion: 0-4.5mm Speed: 8V-8000Rpm Operating voltage: 6-9 V