Nobo Liquid Ink Markers are premium quality and have a spring loaded bullet shaped nib which is sensitive to individual writing styles and allows a smooth flow of ink so text is always bright and easy to read, even from a distance. These 3in1 markers can be used on drywipe boards, flipchart pads and OHP film, and the see-through barrel ensures you always know exactly how much ink is left!3 in 1 marker can be used on drywipe boards, flipchart pads and OHP film