Amazon.com : edding 90 Glassboard Marker - Black - 1 Glass Pen - Round nib 2-3 mm - washable window Marker Pen - for Writing and marking on Glass surfaces such as windows and Glassboards - Dry-wipeable : Office Products
Amazon.com: edding 4095 chalk marker - blue - 1 chalk pen - round tip 2-3 mm - medium-tipped wet wipe pen for chalkboards, windows, glass, mirrors - liquid chalk marker pens for opaque coverage : Office Products
Amazon.com : edding 90 Glassboard Marker - Black - 1 Glass Pen - Round nib 2-3 mm - washable window Marker Pen - for Writing and marking on Glass surfaces such as windows and Glassboards - Dry-wipeable : Office Products