Two ways of inking, ink absorption and using ink sac,built-in water tank module, easy to absorb ink. It is comfortable to grip, Soft hair, flexible, and provide precise control. Both sides of the handshake groove design, ergonomic, long grip is not tired, with positive posture function. The hollow design of the pen allows you to observe the ink residue inside the pen at any time. Suitable for Hand Lettering Sumi Painting Outlining Technical Drawing Comic Manga Scrapbooking whether you're a calligrapher, writer, or artist. Specification: Material: Plastic Coloras Picture Shown Size Chart: SizeL: Approx.13.7 cm / 5.39 inch ,Diameter Size: Approx. 1 cm / 0.39 inch Written out of the Peak Size: Approx.1 cm / 0.39 inch ,Diameter Size: Approx. 0.2 cm / 0.08 inch Package Includes: 1 Piece Fountain Brush Pen Note: Please allow a little size error due to manual measurement. Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the item's color may be slightly different from the pictures. Please understand.