Simple, precise, and waterproof — these are "Milky Speedy Ball" ballpoint pens from the South Korean office-supply company DONG-A. Each retractable ballpoint has an 0.5 mm line width, with smooth and skipless black ink.
What does the name mean? "Milky" refers to the smooth writing sensation of these affordable pens, and "Speedy" refers to their ability to move very quickly across paper. Some ballpoint formulations drag on paper and prevent writing quickly; these pens can go as fast as your hand.
