New formulation erases easily and cleanly. Improved color vibrancy and long-lasting writing. Marks on whiteboard, glass and other non-porous surfaces. Great for laminated planners and calendars. Sturdy pocket clip for portability. Cap can be left off for 24 hours without dry-out. Safe to use at home or school. Low odor and non-toxic. Value Pack-24 for the price of 20! Marker Ink Type: Dry Erase; Marker Tip Type: Chisel; Marker Tip Size (text): Medium; Marker Color(s): Assorted.