Experience smooth ink flow and bold, vivid colors with Intensity Bold Tank-Style Dry Erase Markers. They can be used on dry erase boards, glass and most non-porous surfaces and erase easily with minimal ghosting after you’re done writing These tank-style, chisel-tip markers are great for use at home, in the office or at school. Marker Ink Type: Dry Erase Marker Tip Type: Chisel Marker Tip Size text: Broad Marker Colors: Green.