Please carefully review the product description and photos before purchasing, and make your purchase only if you are satisfied. ○Product Details○ Product Name...D-1K Manufacturer...Zebra Colors...Black, Red Type...Ballpoint pen Ink...Oil-based Features...Single color Body Material...Plastic This is a set of 2 pens, one black and one red. ○Reason for Listing○ I am listing these items to organize my collection. ○Product Condition○ The knock function works without any problems. I have opened the pens once to check the writing. Ink remains and they are usable. The packaging may have some stains. Please judge the detailed condition from the photos. ○Other Information○ The product condition is based on my subjective judgment. If you have any questions, please ask in the comments before purchasing.