Amazon has 12-pack Sharpie Ultra Fine Point Permanent Markers (black) for $5.88. Free shipping with Prime or if you spend $25 or more.
* Extra precise, 0.2mm narrowed tip for extreme control and accuracy.
* Permanent on most surfaces.
* Fast drying, fade and water-resistant ink is AP Certified nontoxic.
* Pack of 12 Markers
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