Coil machines are specialized tattoo machines that use electromagnetic coils to drive the needle up and down. They are known for their reliability and ability to create precise lines and shading. Artists often prefer coil machines for their versatility, as they can be adjusted for different tattooing styles. These machines typically consist of a frame, coils, a power supply, and a needle assembly. The coils generate a magnetic field that moves the needle, allowing for various techniques in tattooing. Many professional tattoo artists choose coil machines for their traditional feel and the control they offer during the tattooing process.