Tattoo Pen Features: 1. Working Voltage: 6-8V. Stroke Length: 3.5mm. The Wormhole Tattoo Machine can work at 10,000 R/MIN. You can change the voltage to accommodate between Liner and Shader. 2. The Tattoo Pen has a coreless motor design. The coreless motor directly drives the tattoo machine to run, making the machine more powerful, reducing vibration, reducing skin damage, balanced coloring, more stable frequency, higher performance, and avoiding overheating of the motor when working for a long time. 3. The tattoo pen is made of aluminum, which is resistant to high temperatures and corrosion. Besides, it is light, easy to carry, and use. 4. Twisted it to adjust the needle stroke. It’s suggested to choose Wormhole Tattoo Cartridge Needles when using this tattoo pen for a better usage effect. WARM TIPS 1.We do not recommend beginners to tattoo on human's skin. If there are no professional prepared working and professional aftercare, the wound may be infected and damage the skin. 2.Please read the manual or chat with us to get the tattoo teaching video and numerous tattoo designs