Available in a variety of weather/fade-resistant colors.
3mm rounded bullet, valve-action tip. Replacement tips available HERE.
Makes permanent marks on both porous and non-porous surfaces including metal, wood, corrugated board, rubber, plastic, and glass.
These markers contain Xylene, a chemical drying agent that allows the ink to better mark oily surfaces.
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Best marker ever
I've been using GPX markers for over 25 years now and I have used others on occasion. These markers hold up well, last a long time and don't leak. They are getting harder to find but I found them.
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GP-X Classic Markers
I've used this same marker on steel for the company I worked for. Retired now, but wanted a few for home use. These are the best out there.