eli5 how is the ball in the tip of the Pen is made/manufactured, how something can be made so small, yet so perfect?

Question

like, it is not only about ball of the Pen, but also about many things, like how small springs are made, and etc.

In: 8

Answer 1

Ballpoint balls are actually considered high precision engineering and up until very recently, nearly all of them came from Switzerland and Japan. China, despite producing billions of pens each year, only recently became able to produce good quality ballpoint balls.