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Black Mark technical pen set arranged in its open case

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Mark Technical Pen Set

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Unverified demo target — Mark keeps 0.3, 0.5, and 0.8 millimeter black fine-liners together in a slim aluminum case. The three line widths cover compact notes, general writing, and visible headings without introducing a large art set. Color variants refer to the pen accents and case ends; every set contains the same black water-based pigment ink.
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About this product

Unverified demo target — Mark is a compact set of three black fine-liners selected for ordinary technical notes rather than a complete drawing studio. The 0.3 millimeter tip handles small labels and detail, the 0.5 millimeter pen covers general writing, and the 0.8 millimeter line creates headings or stronger diagram edges. A number on each cap and a matching barrel ring make the widths easy to distinguish.

The pens use water-based pigment ink on uncoated writing and drawing paper. Drying behavior and water resistance depend on the paper and application, so the set makes no archival, waterproof, or document-security claim. Caps should be replaced immediately after use, and the pens store horizontally in the case. Cartridges and tips are not replaceable.

A sliding anodized aluminum sleeve protects all three pens in a notebook pocket or tote. Black and Orange variants describe the case end and barrel accents; both contain black ink in the same three widths. When the pens are spent, the empty sleeve remains useful for similarly sized writing tools rather than becoming presentation packaging that must be discarded immediately.

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