Use “Acro Ink”'s slim oil-based ballpoint pen for smooth writing.
The shape of the grip is thickened for easy grip and stable writing.
The viscosity of acro ink for acro balls is 1/5 of that of general oil-based ballpoint pens, making it a smooth ink close to water-based , and the ball spins smoothly.
Acro ink is less viscous, so the nib has a good supply of ink. As the ink penetrates deep into the paper fibers, the handwriting becomes even and deep.