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The Uni-ball One gel ink is compatible with Uni-ball One and Uni-ball One F pen models, specifically UMN-S-05/UMN-SF-05.
The ink is specially formulated with large pigment particles that stay on the surface of the paper rather than being absorbed into it. This way, dark shades appear darker and bright shades appear brighter. The ink dries quickly and is smear-resistant, ensuring that notes remain clear and stain-free.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.