Coil tattoo machines are traditional devices used for tattooing that operate using electromagnetic coils. These machines create a rapid up-and-down motion of the needle, allowing ink to be injected into the skin. They are known for their reliability and ability to produce clean lines and vibrant colors. The design of coil machines typically includes a frame, coils, and a needle assembly. Artists can adjust the machine's settings to control the speed and depth of the needle, making it versatile for different tattoo styles. Many tattoo artists prefer coil machines for their tactile feedback and the ability to customize their setup.