A three round liner or five round liner (3RL or 5RL) is the most common but it does depend on the look you are after and the overall effect it has on the tattoo, the colours involved, the shading in the colours if any etc. One liners are also available and used for super fine lines like in portrait eyelashes etc. For tribals and the like it won't matter too much but better with a 5RL so that you can use it to fill the corners before you begin with the shader.
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Tattoo outlines are usually performed with a single need, while shading is done with groupings of needles. This is why the outline, for many people, is the most painful part of a tattoo.
Use anywhere from a 3-7RL, and then switch up to a large mag. Also, make sure that the machine that's packing it is set up for a nice long stroke.