Dixon dry erase markers write on all types of whiteboards and non-porous surfaces, including glass. Opaque inks flow smoothly and evenly on the surface. They wipe away cleanly and easily with a cloth or eraser. Wedge tips provide a variety of strokes. Vented caps conform to small parts specifications. Details:Available in multiple colorsWedge tip for variety of strokes12 markersMarkers write on all types of whiteboards and non-porous surfacesRemoves easily and completelyAP Certified, nontoxic