For artists seeking all-purpose markers, Office Mate's Soni Paint Markers offer permanent application in a variety of line widths and colors! Soni Paint Markers feature fast drying, oil-based ink that is formulated to adhere to all surfaces, such as metals, plastics, glass, ceramics, and wood. The ink is also water resistant and lightfast, allowing these markers to be used indoors, outdoors and for industrial purposes. Once the ink has been applied to a surface, it will not fade or wash away. The creative possibilities are endless, as these paint markers are available in an extra-fine tip, a medium tip, a jumbo tip, and an empty marker for adding custom paint colors!