A Rollerball pen is a pen that is specially used for signing or signing, and has a water-based pen and an oil-based pen. I used to use a pen, and now the pen is gradually replaced by a gel pen. Therefore, all such pens are collectively referred to as: signature pens.
Water-based pens are generally used on paper. If used on whiteboards or samples, they can be easily wiped off. Oil-based pens are generally used for sample signing or other permanent marks. Oily pens are difficult to wipe, but alcohol can be used. Wait for things to clean.

The “signature pen” often mentioned by the signature pen is actually a functional description, and its scope is very wide.

The classification is as follows:

1. The pen tip is a ball-shaped pen, which is classified into water and oil depending on the ink composition used. The ink used in the neutral pen is between water and oil, also known as the "neat pen."

2. The pen tip is a fiber-structured pen with a soft tip and comfortable use, which will be more and more recognized. Constructed like a ballpoint pen, it feels like a pen.

The signature pen can also be classified as a signature pen in a broad sense and a narrow sense. In a broad sense, the pens used for signing are called signature pens. For example, the Parker pens are often used, and the Montblanc pens are used, but they are the pens we used since we were young. From a narrow point of view, it refers to the carbon ink pen or the above, and the test uses a narrow pen, that is, carbon ink pen.