The pen barrel of the ink cartridge-based ballpoint pen is designed with plastic, and the grip section is made of soft elastic material to ensure long-term comfort in writing. The internal pen core does not clog, making the entire writing process very convenient, suitable for use by groups such as students and office workers. Ballpoint pens are currently a popular type of novel stationery internationally, and they are a type of writing tool that uses ball bearings to roll out the writing medium. The writing medium with a viscosity between water-based and oil-based is called a neutral pen, so a neutral pen combines the advantages of both fountain pens and ballpoint pens.