From the new oil-based ink formula to the balanced pen design, the Pilot BPS-GP was made to give you an effortless writing experience. It is considered by some to be the smoothest ballpoint pen available. Some claim that it writes even smoother than a gel pen! The 1.6 mm ballpoint writes a 0.55 mm line. The BPS-GP also features a comfy slip-proof triangular-shaped soft rubber grip and a clear barrel so you can monitor the amount of ink you"ve used.