Avery 29870 MARK A LOT Desk/Pen-Style Dry Erase Marker, Chisel/Bullet Tip, Assorted (Pack of 24) New formulation erases easily and cleanly. Improved color vibrancy and long-lasting writing. Marks on whiteboard, glass, and other nonporous surfaces. Durable chisel tip (1/5") marks in a variety of widths. Cap can be left off for 24 hours without dry-out.