Thin line style dry erase markers feature low odor and bright vivid colors. Use on dry erase boards or glass. Markers wipe away clean and easily. Features a fine tip for a more "pen" style of writing. Markers are AP Certified, non-toxic and conform to ASTM D-4236. Each pack includes 4 markers in assorted colors: Black, Red, Green and Blue. Sold as 12 packs for a total of 48 markers.