These Bi-Office Inkstring XL Drywipe Markers are an innovative Drywipe Marker, designed with a gel type ink, providing a unique and smooth writing experience for the customer. These Bi-Office Inkstring Markers are ideal to be used on all types of whiteboards, including glass whiteboards, at the office, schools, class rooms, meeting rooms, and even at home. The InKstring markers are available in three colours, black, blue and red, to facilitate the communication through the use of different colours, when presenting, teaching, brainstorming, and the like.