This set contains one 3165 Series Rapidograph technical pen, one 3/4 oz. bottle of black Universal drawing ink and a nib key so that you can easily take your pen apart for cleaning and maintenance. The Rapidograph technical pen is perfect for draftspeople, designers, engineers and creatives who are looking for a reliable, high quality pen. This 7-Pen set also includes seven nibs in differing styles for a full range of line widths.