Nissen FPYEM Standard Feltip Paint Marker, Yellow 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 Mark is approximately 1/8" wide