It is a ballpoint pen with smooth oil-based ink "Acro Ink" in a rounded body design inspired by the smooth ink flow.The surface of the metal body has a matte finish that gives it a smooth feel when you squeeze it.The knock system uses a "rotate-out" mechanism.Prevents accidental knocking and ink leaking.It also has a smooth tactile feel when rotating, and it stops when the ball is released.Nib: Extra Fine Point0.5mmInk Color: BlackRefill: BRFN-30EF-B