Nissen FPWHF Fine Line Feltip Paint Marker, White Marks on almost anything metal, plastic, printed circuit boards, glass, wood, paper, leather and textiles Writes on any surface porous or non-porous, rough or smooth, wet, oily and dry Marks are permanent they won't chip, peel, fade, or rub-off. They withstand heat and weathering under adverse conditions. Unique precision valve accurately meters flow, so the right amount of paint passes through the tip Fine line version approximately 0.75mm wide