Tattoo needles aren't a single thingβthere's a range of configurations, each designed for a specific function. Artists choose between them constantly during a session, often switching multiple times. Understanding the basic categories explains a lot about why certain work looks the way it does and what you're experiencing when the sensation changes mid-session.
How needles are described
Tattoo needles are described by two main parameters: needle count and configuration. The count refers to how many individual needle tips are in the grouping. The configuration refers to how those tips are arrangedβin a single row, in a cluster, in a circular pattern, and so on. These two factors together determine what the needle is suited for.
A common notation like "7M1" means seven needles arranged in a magnum configuration with a 1-row spacing. "3RL" means three round liner needles. Once you understand the pattern, most needle labels become readable.
Round liners (RL)
Round liners are the standard tool for creating outlines and fine lines. The needles are clustered in a tight circular bundleβlike a small bouquet of pointsβwhich produces a clean, concentrated puncture that makes crisp, precise lines. The tighter the cluster, the finer the line. A 1RL (single needle) is the finest option, used for extremely delicate fine-line work; a 7RL produces a bolder line suitable for traditional or neo-traditional outlining.
This is the needle most people imagine when they think of a tattoo needle: a small grouped tip that traces the outline of the design. The sensation with a round liner is typically a sharp, consistent sting along the line being drawn.
Round shaders (RS)
Round shaders have a similar circular cluster to liners but with slightly more spread between the individual needles. This spacing means they deposit ink over a slightly wider area per pass, making them suited for filling small to medium areas with solid color or black, and for softer shading in contained spaces. A 7RS, for example, is often used for small color fills and shading on compact designs.
Magnums (M1, M2, curved magnum)
Magnums are the workhorse for shading and color packing in larger areas. Instead of a circular cluster, the needles are arranged in two offset rows (M1, the standard magnum) or a single curved row (curved magnum, also called a soft edge or round magnum). The offset arrangement lets the needle deposit ink in a smooth, graduated patternβideal for blending and soft transitions.
The curved magnum is particularly popular for smooth gradients and shading because its curved arrangement matches the natural contour of skin, making contact more even and reducing streaking. You'll often see curved magnums used in portrait work, realism, and any shading-heavy style. The sensation with a magnum is typically softer and more diffuse than a linerβless sharp, more like a buzzing pressure across a wider area.
Flat needles
Flat needle configurations arrange the needles in a single straight row. They deposit ink in a sharp, wide strokeβuseful for geometric designs, tribal work, solid black fills that need a clean edge, and certain color saturation techniques. The single-row arrangement produces a more defined, angular mark than a magnum's softer blur.
What the switching means for you
When your artist changes needle configurations mid-session, they're switching tools for different tasks. Lining with a round liner, then switching to a curved magnum for shading, then back to a liner for detail work is completely standard. The sensation change between a liner and a magnum is noticeableβclients sometimes interpret the shift as the artist changing their approach or the work getting harder, but it's just the appropriate tool for the next task.
The quality of the result depends far more on the artist's skill and judgment in selecting and using the right needle than on the specific brands or configurations used. Two artists with the same needle type will produce very different work based on technique, speed, and approach.