These Faber-Castell Connector Pen Whiteboard Markers are a great option for anyone who frequently misplaces their whiteboard markers. The connector lid will help you keep the markers all together, ensuring that you have multiple colours to write with. Each marker has a 3mm bullet tip which provides a wide line. They are perfect for use in any environment that has a whiteboard. The dry erase ink creates thick, bold lines. The connector lids keep your markers together. There are 4 markers in this pack, 1 of each blue, black red and green.