Black ink marker with a 1mm fine bullet tip.
Certified for detailed marking on smooth surfaces in lab conditions that may encounter things such as extreme high/low temperature changes. These markers are also known for their lightfast and abrasion-resistant qualities.
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Disappointing
I didn't find this product to be as abrasion resistant and permanent as I hoped it would be. It goes on much thicker and darker than a sharpie but I didn't notice a difference in durability.