Features: 1. The thin nib is equipped with a coded cover and a pocket clip cover, which is lightweight, easy to hold, and very durable. 2. Black double-ended hook line pen, water-based, acid-free, long-lasting waterproof, will not fade, stain, or bleed. 3. Various sizes available with options for 0.1mm, 0.3mm, and 0.5mm tips. 4. Ideal for note-taking, diary writing, technical drawings, etc., providing a good experience and clear ink colors. 5. Suitable for architects, designers, illustrators, students, writers, and sketch artists, meeting the diverse needs of ink works. Specification: Item Type: Line Drawing Pen Product Material: Ink, Plastic Product Quantity: 12 Pcs / Box Product Use: For Stippling, Drawing, Coloring Package List: 12 x Line Drawing Pen