The Rapidograph technical pen is perfect for draftspeople, designers, engineers, and creatives who are looking for a reliable, high quality pen. Packed in a reusable, protective plastic case, each Rapidograph pen features a stainless steel nib in differing sizes for a full range of line widths. The pens also feature a white plastic barrel with a refillable ink reservoir (pens do not come filled with ink), and a color coded cap for nib selection. This set also contains a bottle of black drawing ink and a nib key so that you can easily take your pen apart for cleaning and maintenance. Details:Black inkAssorted tip sizes7 refillable pensUniversal drawing inkMade of impact and chemical resistant componentsSelf polishing stainless steel point