By color

⑴ Monochrome ballpoint pen: This is the most common ballpoint pen, often in blue, black, red, etc.

⑵ Two-color ballpoint pen: generally red and blue two-color.

⑶ Three-color ballpoint pen: red, blue and black.

⑷ Four-color ballpoint pen: red, blue, black and green. In addition to these four, there are six-color, eight-color, and even twelve-color ballpoint pens.

According to structure

⑴ Disposable ballpoint pen, the penholder is the refill, neither can add ink nor change the refill. If the ink runs out, it can only be discarded.

⑵ Ballpoint pen that can change the refill, with buttons, spring, lock, recovery and other functions.

⑶ The pen barrel can be rotated to extend or retract the pen core.

⑷ There are new ballpoint pens such as a combination of ballpoint pen and fountain pen, a combination of ballpoint pen and pencil, a combination of ballpoint pen and electric tester, and a combination of ballpoint pen and tiny light bulb.