The water-based ink in this pen allows for smooth writing and no bleeding through paper. The tip of the pen uses a mechanism to keep the ink from flowing in the other direction and drying out. The ink produces very bright and vibrant colours. The knock mechanism gives a clean and easy writing experience. Comes in 0.5mm pens. Product Details Material: Polypropylene, ABS resin, Steel Dimension: 14cm; The nib comes in 0.5mm only. Country/Region of Origin: Japan Additional Information: Keep them away from high temperatures Contents: 10pcs. Black, Red, Blue, Orange, Gray, Green, Yellow, Asagi, Blue Black, and Purple. ⚠ Warning: Cancer - https://www.p65warnings.ca.gov/