Known for its smooth-flowing ink and its writing performance, the UM-100 pens are top-notch pens hidden in an economical body form.
Available in 0.5mm, 0.7mm, 0.8mm at the link below:
0.5mm: https://www.bunkuya.com/products/uni-ball-signo-roller-gel-pen-um100-05
0.7mm: https://www.bunkuya.com/products/uni-ball-signo-roller-gel-pen-um100-07
Colors may vary according to different nib sizes.
Please take note:
- When the pen is positioned in a downward position, the ink flows smoothly from the ink flow channel.
- When the pen is positioned in an upward position, the reverse flow prevention ball works to stop the flow of air into the ink.