- This ball pen is very easy to use.
The tip of the ball pen has a ball-shaped steel ball.
Ball pen is a modern writing tool.
The price of a ball pen is usually very cheap.
The improvement of production technology has made the quality of the ball pen very good.
You can buy a very useful ball pen at a very cheap price.
Ball pens are easier to use than fountain pens.
After the advent of the ball pen, it quickly became popular and replaced the fountain pen as the mainstream writing tool.
A lawyer in the United States invented the prototype of a ballpoint pen in 1888, but it was not very useful.
In the 1930s, Hungarians invented a useful ball pen and applied for a patent.