The ball is used to directly contact the paper surface to generate friction when writing so that the ball rolls in the ball seat and brings out the ink or ink in the pen core to achieve the purpose of writing.
A ballpoint pen is a pen that uses ink and different pigments to write. The nib is a small steel ball. The small steel ball is embedded in a small cylindrical copper bowl and then connected to a plastic tube containing ink. The ink flows down from the surroundings as the steel ball rotates.
