Uni Jet Stream ballpoint pen EDGE black (0.28 mm)

The Jetstream Edge by Mitsubishi Uni is the world's first oil-based ballpoint with a 0.28 mm nib – a line width that was long exclusively the domain of fibre-tip pens. The hexagonal plastic barrel sits firmly in the hand, whilst the lightly knurled metal grip provides secure purchase without fatigue. The tapered design – broad at the top, slender towards the tip – positions the weight close to the paper, making precise writing easier even over extended distances.

Features

• 0.28 mm needle point tip: The tapered tip leaves your writing point clearly visible – ideal for tight lines, graph notebooks with fine grids or dense notes in planner layouts.
• Oil-based Jetstream ink with low viscosity: The nib writes with minimal pressure and no smudging. Characteristic of Jetstream: rich, deep black with crisp line edges from the moment you touch paper – no start-up lag like many gel rollerballs.
• Document-proof, water-resistant, lightfast: The ink is suitable for legal documents, signatures and archive notes. No smudging from moisture, no fading under light exposure.
• Hexagonal barrel: The cross-section prevents the pen from rolling off the desk and automatically orients your hand into a stable writing position.
• Knurled metal grip zone: Cool, matt feel directly at the grip area – non-slip even during extended writing, with no rubber coating needed.
• Replaceable refill: Compatible with the SXR-UF28 (Uni ballpoint Jetstream 0.28 mm refill), available in the LUIBAN range.

Use & Tips

• Small handwriting, tight grids: The 0.28 mm nib writes legibly even in 3 mm and 4 mm line spacing. If you work in bullet journals or daily planners in confined spaces, this line width gives you considerably more room per page.
• Technical drawing and annotation: The needle point allows precise marking in diagrams, maps or densely printed forms, where thicker nibs blur and bleed.
• Paper recommendation: Line clarity and colour saturation are at their best on smooth, calendered paper (e.g. 90 g/m² and above). On very rough or absorbent paper, the fine ball can catch slightly.
• Signatures and important documents: Thanks to document-proof and water-resistant properties, the black ink is suited for legally valid signatures and archive records.
• Left-handed writers: The quick-drying oil-based ink scarcely smudges, making this pen a reliable choice when writing from right to left.

For Writing Instrument Enthusiasts

Jetstream ink is based on emulsion technology, where oil and water components are balanced so that viscosity is significantly lower than conventional oil ballpoint pastes. The result is a writing feel that approaches the smoothness of gel rollerballs, whilst retaining the drying advantages of oil-based inks. The 0.28 mm ball is particularly relevant for this ink viscosity: the finer the ball, the more noticeable thick paste becomes through scratching or skipping – the low-viscosity Jetstream formula compensates for this directly at the tip. The conical point-tip design of the tip sleeve is not merely aesthetic: it reduces the contact surface around the ball and thus improves the clear view of your writing point – a noticeable difference from conventional conical ballpoint designs of the same width.

Technical Specifications