This signo gudetama pen is a limited edition. With 0.38 mm suitable for writing your tasks, writing notes, marking your calendar, or decorating your scrapbook with colorful text. It's smooth writing, exceptional ink quality, an outstanding selection of colors and tip sizes, the UM-181 Gudetama Series is one of our all-time favorite gel pens. The sturdy tip does not bend or break, even with heavy-handed use. The pigment-based ink flows smoothly and is waterproof, fade-resistant, and weather-resistant. Much of this great performance is due to the special viscous properties of the ink.