Each marker has a 3 mm bullet tip which provides a wide line. They're perfect for use in meeting rooms or classrooms where you need to write on a whiteboard and ensure your markings are seen. The water-based ink produces vibrant colours and can be easily removed with a whiteboard eraser or dry cloth. You can clip these markers together, making it easy to store them. You don't have to worry about your markers drying out if you accidentally leave the cap off for up to 24 hours. There are 10 markers in this pack, in assorted colours.