Rm on a tattoo needle is an abbreviation for “round liner”, which is a type of tattoo needle used to create lines and outlines of the design. It consists of a group of needles that form a tight circle and can be used to create fine details and lines in the tattoo. Round liners are a staple tool in any tattoo artist’s toolkit and are used to create the first outline of the tattoo as well as to add shading and texture to the design.
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