Marker pen trodat Uni‑Ball Pin 04 — black, 1 pc, 0.4 mm tip

trodat Uni‑Ball Pin 04 marker pen in black is a fine‑point drawing and writing instrument designed for precise lines and consistent ink flow. The pen features a 0.4 mm steel nib and waterproof, fade‑resistant ink that remains stable when used alongside watercolour or other wet media. Its compact, pocket‑friendly body is suitable for everyday use in office, school, studio or field work where fine permanent lines are required.

Advantages

The pen delivers a consistent 0.4 mm line width with a durable steel tip that resists wear during stencil work and technical drawing. The uni Super Ink formulation is waterproof and fade resistant, providing permanence and reduced risk of smudging when used with liquid media. The slim, balanced design offers comfortable handling for precise handwriting, note‑taking and detailed sketches.

Suitable for

• Technical drawing and drafting
• Illustration, sketching and ink work with watercolours
• Precision handwriting and note‑taking
• Use with stencils and templates
• Field work and portable sketching

Key specifications

• Tip size: 0.4 mm fine point
• Ink colour: black
• Nib material: steel tip for durability
• Ink properties: waterproof, fade‑resistant, permanent
• Pack quantity: single pen (1 pc)
• Design: compact, pocket‑friendly barrel

How to use

Remove the cap and hold the pen at a comfortable angle for precise control. Use light, even pressure when drawing fine lines; the 0.4 mm steel nib will provide consistent ink flow without excessive force. Replace the cap after use to prevent the tip from drying. When working with watercolour or other wet media, allow the ink to dry briefly before applying washes to ensure the waterproof properties take effect.

Usage recommendations

For best results, store horizontally or with the tip down to maintain consistent ink flow. Test on a scrap piece of the intended paper to confirm drying time before applying extensive washes or layering. Avoid using on very glossy, non‑absorbent surfaces where permanent ink adhesion may be reduced.