FriXion Ball Knock Zone responds to the voice of users looking to increase their ink capacity and is a next-generation model that can write dark and longer. Equipped with a version 2 refill that uses premium friction ink. It has high functionality, such as chip hold system to reduce the rattling of the nib, and noise cutting knock to reduce knocking. Features: Ver. 2 (Version 2) refill; This metal refill uses a newly developed premium friction ink that can write dark and long in response to the voice of users looking to increase ink capacity. Premium FriXion Ink is enhanced by 30% in black and 15% in red and blue than traditional FriXion ink, so you can write dark and high visibility. Chip hold system: The tip is equipped with a newly developed tip holder. The special 3-way parts hold the tip firmly in place to reduce the rattling of the nib and help you concentrate with a steady writing experience. Noise-cutting knock: The internal parts have added spring to soften the impact of knocking, and it features a quiet knock sound. Compared to conventional products (*), we cut 78% of the sound when knocking (*Comparison with friction ball knock).