Specifications:
Brand: deli
Smooth ink upgrade, tungsten carbide ballpoint pen tip
Strong compatibility, smooth ink, tungsten carbide ball
Models: 400, 400M
Transparent pen body, 20 pens per box
Scientifically formulated ink for stable writing
Improved smooth ink for enhanced writing experience
Next-generation precision pen tip
Diamond-like tungsten carbide ball for high durability
Ink smoothness, viscosity, adhesion, and saturation enhanced through multiple experiments
Writing experience significantly improved
Writing length up to 400 meters
0.5mm line width
High-quality ink for smooth writing
Tungsten carbide ball hardness: 96GPa
Writing length equivalent to circling a 400m track
Ink capacity for smooth line drawing over 400m
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