● This multi-color pen allows you to use four different gel ink colors with a single pen. ● Features a knock mechanism for smooth color switching. ● Very convenient for meetings and outings. ● Gel ink provides a smooth, flowing writing experience. ● One pen with four ink colors: black, blue, red, green + 0.5mm mechanical pencil ● Ballpoint diameter: 0.5mm, Mechanical pencil: 0.5mm Thank you for viewing. I am selling this pen because I purchased it but never used it. I have confirmed that all four colors write. There are no noticeable scratches, and it is in beautiful condition. There is no packaging, and it has been stored at home. Therefore, please understand this before purchasing.