These uni inkview whiteboard dry wipe markers give you a set of top quality whiteboard pens these whiteboard markers feature a visible ink feed to let you know when its running out they have bullet shaped nibs of 18 to 22 mm for easy clear lines there are four colours included in this set black blue red and green they are ideal for use in presentations teaching work projects and more simply pick up a pen and make your marktip size 18 22 mmfour packeasy clean marker pensfor use