In the past, and for some still today, tattooing is associated with bold lines and bright colors. Those bold lines are done with a so-called round liner that consists of several smaller needles soldered onto a needle bar. Tattoo artists talk of a seven-liner, nine-liner and so on. The needle bar is placed in a grip and mounted onto a tattoo machine which is usually driven by electro-magnetic coils or a rotary device. A micro tattoo on the other hand is usually done ‘single needle’: with just one ultra-fine needle soldered onto the needle bar.