5 mm up to a 4

For best possible results we recommend you use fully covering acrylic pens

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it's waterproof

sakura koi coloring brush pen Idwrap 5 mm up to aThe Sakura Koi Coloring Brush Pen uses a flexible polyacetal brush tip designed to behave like an actual paintbrush rather than a typical felt marker tip it bends under pressure and bounces back to a fine point as soon as you lift off, so you can move between thin detail lines and broad sweeping strokes without switching pens. Pressure controls the width, from a fine 0. 5 mm line up to a 4. 0 mm wash. The ink is a water based, solvent free dye built