Ballpoint pens and rollerball pens are different.

A signature pen is a pen with unique writing functions, usually used for signing or signing contracts in formal occasions. The ink of the signature pen is water-based and can penetrate into the paper, so the written words can remain clearly on the paper.

The ballpoint pen is a pen that uses oil-based ink. Its characteristic is that it can form a smoother writing surface on the paper, and the written words can present a fuller effect on the paper. .

Therefore, although ballpoint pens and rollerball pens are both common writing tools, they are different in terms of use occasions and writing characteristics.