This is a nib for a Pelikan fountain pen. The line width is "B (Broad)". I previously purchased this for my M400, but as I have no plans to use it, I'm offering it to someone who wants it. This item was originally sold for the M200, but the nib is interchangeable and can also be used with the M400 and M600. It's very convenient as you can simply twist the nib off and on. Before listing, I confirmed that it fits my M400 without issue, but depending on the manufacturing year, there may be slight differences in the shape of the nib base, so please be aware that replacement is at your own risk. There is no protective case, so I will protect it with tissue paper, etc., before shipping. It will be sold as-is.