Ink is formulated to erase easily and cleanly. Improved color vibrancy and long-lasting writing. Marks on whiteboard, glass, and other nonporous surfaces. Durable chisel tip marks in a variety of widths. Cap can be left off for 24 hours without dry-out. Safe to use at home or school. Low odor, non-toxic. Desk-Style Value Pack24 for the price of 20 Marker Ink Type: Dry Erase Marker Tip Type: Chisel Marker Tip Size text: Broad Marker Tip Size numeric: 4.8 mm.