Features: 1.The thin nib is equipped with a coded cover and a pocket clip cover, which is light in weight, easy to grasp, and very durable. 2.Black double ended hook line pen, water based, acid free, long lasting waterproof, will not fade, stain, and bleed. 3.Various s, various choices, three s 0.1mm, 03mm 0.5mm can be selected. 4.Very suitable for taking notes, writing diaries, technical drawings, etc., with good experience and clear ink colors. 5.Suitable for architects, designers, illustrators, students, writers and sketch artists, can meet the different requirements of ink works. specification:Item Type: Line Drawing Pen Product Material: Ink,Plastic Product s: 12 Pcs / Box Product Use: For Stippling, Drawing, Coloring PackageList:12 x LineDrawingPen