Optimized for use on contemporary, super smooth glass surface boards. Delivers bold color with best in class liquid ink delivery system. Low odor, easy to erase markers are great for any environment. Bullet tip creates thick, broad lines for messages that are clear and easy to read both up close and from a distance. Glass board dry-erase markers feature a see-through ink gauge to clearly see how much ink remains. Marker Ink Type: Dry Erase; Marker Tip Type: Bullet; Marker Tip Size (text): Broad; Marker Color(s): Black.