Pilot G-Tec-C 0.25mm – is a hyper fine rollerball gel ink pen. The 0.25mm tip writes a 0.13mm line and is ideal for where fine precise writing or detailed graphics are required. The pens ink has been specially designed to prevent it from bleeding. These pens are extremely rare in the UK and are a specially imported item. They are also known as a Hi-Tec-C 025 in other parts of the world.
I have been using Gillio pocket sized graph paper for my bullet lists and those grids are tiny. I also need to correct graphs for my job and this fine pen which does not feather or bleed really works well. They would not be a pen for the heavy-handed with giant loopy writing but then no very fine writing implements are suitable for this.
Find them at (my favorite shop for pens) Cultpens.com, who says this about them:
The Pilot G-Tec-C 0.25 is a hyper-fine gel ink rollerball, employing a truly tiny needle-tip roller system to write a precise 0.13mm line. The bio-polymer ink prevents feathering and ensures a clean sharp line.
A remarkable pen, very rare in Europe. Model BL-GC25, also known as the Hi-Tec-C 025 in some countries (and pen colours other than black/blue/red carry the Hi-Tec-C name).
These pens have exceptionally fine and sharp nibs – they only need a light touch and are not suitable for the heavy-handed!
Available with Black Blue Red Green Brown Light Blue or Blue-Black ink. (they also do violet ink which is lovely!)