Script Liner Brush Sizes Explained: From 20/0 to Size 6

A script liner looks like a round brush that has been stretched. The hairs are long and slender, the tip comes to a fine point, and the whole brush holds far more thinned paint than its narrow profile suggests. Those long hairs are what let a painter pull a continuous line across six or eight inches of canvas without reloading. Understanding script liner brush sizes is mostly a matter of learning what the numbering system means, how hair length changes the behavior at each size, and which size suits which job.

Sizes are only useful once the brush itself is well made, since a liner that splits or will not hold a point is useless at any number. Our review of liner brushes for fine detail work covers the construction qualities to look for; this article explains how to read and choose among the sizes.

How Brush Sizing Works

Brush size numbers refer to the ferrule diameter and the quantity of hair in the bundle, with larger numbers meaning fatter brushes. The scale runs in two directions from zero. Above zero, sizes go 1, 2, 3, 4, and so on. Below zero, the sizes are written as a number followed by “/0” (read “aught”), with larger first numbers meaning smaller brushes: 2/0 (double-aught) is smaller than 0, 5/0 is smaller than 2/0, and 20/0 is about as fine as brushes get.

Two caveats apply to any brush, and especially to liners:

• Sizes are not standardized between manufacturers. One brand’s size 2 can match another’s size 1. Sizes are consistent within a single line from a single maker, and that is all.
• Size says nothing about hair length. This is what separates liner types from one another. A size 1 round, a size 1 liner, and a size 1 script liner all have roughly the same ferrule diameter and very different hair lengths.

Script Liner vs Liner vs Rigger

The names overlap and vary by brand, but the general distinctions are:

In practice, many brands use “script liner” and “rigger” for essentially the same brush. The key behavior they share is that the long hair acts as a paint reservoir and a shock absorber: hand tremors are damped before they reach the tip, and the line stays even over a long stroke. For a closer look at the two terms, see rigger brush vs liner.

Script Liner Brush Sizes and What Each Does

Dimensions below are approximate and vary by maker. The point is the relative progression.

Line width is a range rather than a fixed number because a liner’s line depends on pressure and paint consistency as much as on size. The same size 1 can pull a hairline with the tip barely touching or a 2 mm line pressed down to the belly.

How Hair Length Changes Behavior at Each Size

Longer hair holds more paint, damps hand movement more, and is harder to control for short, precise marks. Shorter hair gives crisper starts and stops but runs dry sooner.

• Small sizes (20/0 to 2/0): the hair is short in absolute terms even though it is long relative to the diameter. These brushes run out of paint quickly and are meant for strokes of an inch or two. They are precise but unforgiving of thick paint, which clogs the fine point.
• Middle sizes (0 to 2): enough hair to carry paint for a four-to-six-inch line, enough stiffness to keep control. This is why size 1 is the default recommendation for anyone buying a single script liner.
• Large sizes (4 to 6): hair long enough to feel floppy to a newcomer. Controlled from the shoulder rather than the fingers, these pull a foot or more of continuous line and suit lettering and ornamental work. They demand consistently thinned paint.

Choosing a Size by Painting Scale

A useful rule: match the liner size to the canvas size, not to the thinness of line you want. Line thinness comes from pressure and dilution; the size decides how far you can travel before reloading.

Choosing a Size by Subject

• Tree branches and twigs: size 1 or 2, pulled from trunk outward, lifting pressure to taper. Fine twigs at the ends with 0 or 2/0.
• Grasses and reeds: size 0 to 2, flicked upward with a quick lift so the line thins to nothing.
• Whiskers, hair strands, eyelashes: 10/0 to 2/0 depending on the scale of the face.
• Rigging, wires, masts: size 1 or 2 for most paintings; the original purpose of the rigger.
• Veins on leaves and petals: 5/0 to 0.
• Signatures: 2/0 to 2, matching the size of the painting.
• Lettering and script: 2 to 6, with the brush held upright and the hand moving from the arm.
• Outlining in illustration or folk art: 0 to 2 for consistent weight.
• Cracks, wood grain, and texture lines: 0 to 2 dragged with varying pressure.

Brush Liner Tips for Getting the Most From Any Size

1. Thin the paint to an ink-like consistency. Acrylics and oils straight from the tube will not flow from a liner. Thin acrylics with water or a flow medium, oils with a little solvent or medium, until the paint drips slowly from the tip. This single habit solves most liner frustrations.
2. Load the whole length. Roll the brush in the thinned paint so the hair fills from ferrule to tip, then draw it across the palette edge to reform the point. A half-loaded liner runs dry mid-line.
3. Hold the brush upright. Vertical to the surface, the tip makes the thinnest line and the paint feeds evenly. Angling the brush widens the line and empties it faster.
4. Move from the arm, not the fingers. For lines longer than an inch or two, lock the wrist and move the forearm or whole arm. Finger control produces wobbles.
5. Brace your hand. Rest the little finger or the side of the hand on the canvas or a mahl stick for steady short lines.
6. Keep moving. Hesitation makes blobs. Commit to the stroke and travel at a steady speed.
7. Vary pressure to vary width. Light at the start, press slightly in the middle, lift at the end for a tapered stroke like a grass blade or branch.
8. Wipe and reshape between strokes. A liner’s point splits when paint dries in the hair. Rinse often, reform the tip on a cloth, and never leave it standing in water.

Hair Type and Size Interact

The same size behaves differently depending on what it is made of.

• Synthetic (nylon or taklon): springy, snaps back to a point, tolerant of acrylics. The standard for script liners today. Softer synthetics hold more paint; stiffer ones give more control.
• Kolinsky or red sable: holds a point beautifully and carries a lot of fluid paint, favored for watercolor and oil lettering. Expensive, and acrylic shortens its life.
• Synthetic sable blends: a compromise many painters settle on for liners, combining spring with capacity. See our roundup of synthetic sable brushes for how these blends compare.
• Squirrel or ox hair: very soft, enormous capacity, little snap. Used in sign-painting quills, not in general-purpose liners.

A size 2 in soft sable will pull a longer line than a size 2 in stiff synthetic because it holds more paint, but the synthetic will be easier to steer.

Building a Liner Set

Few painters need the whole range. A sensible progression:

• One brush: size 1 script liner. It handles most detail on canvases from 8 x 10 to 24 x 36.
• Two brushes: add a 2/0 or 10/0 for fine detail, or a size 4 if you work large or letter.
• Three brushes: 10/0, 1, and 4 cover almost every scale.
• Specialist additions: 20/0 for miniatures, 6 for signs, a short liner for crisp outlines where the long hair is too floppy.

Buy liners individually rather than in generic sets when possible. Sets often include sizes that overlap and skimp on the quality of the point, which matters more in a liner than in any other brush shape. For the differences between liner families before you choose, our explainer on the difference between rigger brush and liner brush lays out which long-haired type suits which strokes.

Common Sizing Mistakes

Buying the smallest size for thin lines. A 20/0 does not make a thinner line than a 1 in practice; it just runs dry sooner. Thin lines come from a good point, thin paint, and light pressure.

Expecting sizes to match across brands. They do not. Compare by actual hair length and diameter when switching makers.

Using a script liner for short, sharp marks. The long hair that gives smooth long lines makes crisp starts and stops harder. A short liner or a small round is better for those.

Using thick paint. Any size clogs and skips with tube-consistency paint. Thin it.

FAQs

What size script liner brush is best for beginners?

Size 1. It is long enough to pull continuous lines, small enough for most detail, and forgiving of slightly thick paint. Add a smaller and a larger size later.

What does 10/0 mean on a brush?

It is read “ten-aught” and denotes a size ten steps below 0 on the sizing scale, making it one of the finest sizes available. Larger first numbers before the slash mean smaller brushes.

Is a script liner the same as a rigger brush?

Nearly. Both have very long, fine-pointed hair for continuous lines. Some brands make riggers slightly blunter or shorter than script liners, but many use the names interchangeably.

What brush liner tips help with shaky lines?

Thin the paint to ink consistency, load the full length of the hair, hold the brush upright, move from the arm rather than the fingers, brace your hand on a mahl stick or the canvas edge, and keep the stroke moving at a steady speed.

How long is the hair on a script liner?

Typically two to three times the length of a round brush of the same size, roughly 16 to 20 mm on a size 1 and up to 30 mm on a size 6, though this varies by manufacturer.

Can I use a script liner for watercolor?

Yes. Sable or soft synthetic script liners are excellent for watercolor branches, grasses, and calligraphic marks because they hold a lot of fluid paint and release it evenly.

Next Step

Start with a size 1, learn to thin paint and load the full hair, and the rest of the size range will make sense from experience: go smaller when the brush is too long for the scale, larger when it runs dry before the line ends. When you are ready to buy, our guide to the best liner brushes for detail painting compares current options by point quality, hair type, and the sizes each maker does well.