can create bold or precise lines by adjusting angle of the nibWriting smoothly and drying quickly with washable ink can easily wiped off from whiteboards, glass, mirror, and most non-porous surfaces with any cloth or eraserInk has low odor and environmental protectionPerfect for use in classroom, office, home and studio with whiteboards, glass, mirrors, and non-porous surfaceService guarantee: if you are not satisfied with our products or have any questions, please feel free to contact us