Mitsubishi Pencil Uniball ZENTO Water-Based Ballpoint Pen Refills, 0.38mm, Black, Pack of 10 UBRZ38.24 10P 1320 Product description uniball ZENTO Refills (10 pieces) A soft, water-based ballpoint pen that makes writing a comfortable experience. Equipped with newly developed ZENTO ink. Equipped with newly developed ZENTO ink It features a stress-free, soft writing feel and clean lines with minimal bleeding. ●The "cushion ingredient POA surfactant" (polyoxyalkylene) provides a soft writing experience by acting as a cushion between the ball of the pen tip and the paper, reducing frictional resistance* when writing. *Approximately 40% less than our previous product ● "Attraction particles" that prevent ink from spreading or bleeding By attracting inks together, it reduces bleeding and bleed-through of lines. Product Name: Mitsubishi Pencil Uniball ZENTO Water-Based Ballpoint Pen Refills, 0.38mm, Black, Pack of 10, UBRZ38.24