Uni-ball Uni Compo Fineliner, 0.3 mm, Ultra-Fine Plastic Tip, Waterproof Ink, Smooth Flow, Ideal for Writing & Drawing - Green

A 0.3 mm tip is ideal for indexing, labeling, fine annotations in planners or spreadsheets, precise outlining in drawings, and any work that requires very thin, clean lines without feathering.

Ultra-Fine Control: 0.3 mm line width. Waterproof pigment ink for smudge- and fade-resistance after drying. Smooth ink flow to reduce skips. Precise plastic needle-point tip for small boxes and form fields. Slim, balanced barrel for steady handwriting.

Yes. The pigment-based ink is waterproof and designed to resist smearing and fading over time after it dries, helping keep labeled pages tidy.

It performs well on standard office and notebook papers. For best results, use on uncoated or matte surfaces. On glossy or coated papers, allow extra drying time to prevent any potential smearing.

Write with a light, steady pressure and avoid pressing hard. Let the ink begin to flow with a smooth motion, and maintain a comfortable angle (about 30–45 degrees) to ensure consistent delivery.

Cap the pen when not in use to prevent the tip from drying. Store it with the cap on, ideally horizontally or vertically tip-down in a pen stand to keep ink flow consistent and prolong ink life.

Yes. The ink is non-toxic and suitable for typical school, office, and personal use. As with any writing instrument, keep it away from young children who might put it in their mouths.

The 0.3 mm size delivers razor-thin lines ideal for dense layouts and fine details. For bolder lines or larger labels, you might consider larger tip variants (such as 0.4 mm or 0.5 mm), which produce quicker, more visible strokes.

Labeling charts and spreadsheets, adding fine annotations in technical drawings, marking up plans or diagrams, indexing pages in manuals, and making precise notes in planners or notebooks.

The Uni Compo Fineliner line commonly includes color variants (like green in this model) and may be sold in individual units or value packs. Check Fepy for current color availability and bundle options.

Consider purchasing in packs if you frequently use fineliners, look for refillable or multi-pack options, and compare prices or bundles on Fepy to maximize value per pen while ensuring you have a reliable backup when one runs out.