Mr. Pen drawing pen set includes 8 professional-grade black ink pens, each with a uniquely sized tip for a variety of line weights, suitable for technical drawing, sketching, and writing.Tip sizes range from a precise 0.4mm (04) to a bold 3mm (30), along with varied styles including 0.6mm (08), 1.0mm (10), 2.0mm (20), and expressive brush tips in small (S), medium (M), and large (L).Ideal for artists, architects, and illustrators, these pens provide smooth, consistent ink flow for crisp lines and clear, detailed work without smudging or bleeding through the paper.Ergonomically designed for comfortable, long-term use, the pens feature a lightweight barrel that is easy to handle, enhancing control and precision for all skill levels.Mr. Pen drawing pens are non-toxic and water-resistant, offering the durability and reliability required for both professional projects and personal creative endeavors.