Experience smooth ink flow & bold, vivid colors with Intensity Bold Tank-Style Dry Erase Markers. They can be used on dry erase boards, glass & most non-porous surfaces & erase easily with minimal ghosting after you're done writing! These tank-style markers are great for use at home, in the office or at school. Marker Ink Type: Dry Erase; Marker Tip Type: Bullet; Marker Tip Size (text): Extra-Broad; Marker Color(s): Assorted.