FriXion Point Knock Biz is an ultra-fine erasable ballpoint pen that uses the features of "FriXion" that disappears when scraped and features "Synergy Chip" for smooth writing and smooth writing. The Synergy Tip is a pipe tip that is suitable for fine writing, and the tip of the stainless steel pipe is a conical shape that is strong and stable to write with the characteristics of the cone chip, which is used for regular ballpoint pens. This allows for fine writing, yet the high strength of the nib ensures smooth ink supply and smooth writing.