What are round liner tattoo needles used for?

Round Liner (RL): Round liner needles are for lining and outlining the designs. These are tightly grouped needles, organised in a circular form. Round Shader (RS): Round shader needles are for shading. These are needle points organised in a circular form, but not as tightly grouped as a round liner.

A 'round' needle that is tightly soldered into a pointed shape may hold up to fifteen needles. This is used for outlining a tattoo. A soldering of up to fifteen needles will be used for colouring and shading.