Chisel Tip: Durable 3-way, Chisel Tip Allows You to Mark Broad, Medium or Fine Lines. Fine Tip: Fine tip marker for fine lines on smaller boards. For use on whiteboards, glass and most non-porous surfaces. Specially formulated low odor ink. Recap when not in use. If left uncapped for an extended period of time, recap for 24 hours and marker should recover. Store in horizontal position when not in sue. Conforms to ASTM D-4236.