Four-color Edding E-95 Glass Marker Set: For writing and marking on most glass surfaces and glass boards, use a glass marker. Suitable for whiteboards as well The majority of glass surfaces and glass boards can easily be cleaned of the writing using a dry wipe. The glass marker is now operational. The round nib's stroke width is between 1.5 and 3 mm. The brill and opaque properties of the glass marker ink