This is especially recommended for housewives and students who want to run a small side business with a monthly net profit of around 200,000 yen. About four years ago, I was selling pens specifically for pen spinning as a side business, but due to my main job becoming very busy, I no longer had time to assemble and sell them. Therefore, I have decided to sell off all the remaining inventory. At the time, I was making a net profit of around 200,000 yen per month selling these pen spinning pens on Amazon (self-fulfillment). This product, if assembled properly and sold steadily, could generate a profit of several hundred thousand yen per month. However, this is a hypothesis based on sales performance from several years ago, and market conditions are constantly changing, so I cannot provide any guarantees. There are also rare pens that are no longer in production. All are new, but some pens, such as ZEBRA, are missing some pieces or have damaged packaging. The main components are for assembling pens like Buster CYL2 and Ivan Mod. The ratings are mostly over 50, with some over 300. Reference ASIN (B07M5LZBWG) I can also introduce you to a friendly supplier in China (Taobao). It is possible to outsource the assembly and direct delivery to Amazon within China to the supplier and a forwarding agent. Regarding the pens' usability, please assume that almost all of them cannot be used for writing, as several years have passed. Regarding the pens' original function, I have not tested them, so they are treated as junk items and are sold as-is, with no returns or refunds. Assembly methods can be found online. I will also provide as much backup as possible. I hope that those who are considering developing a new, low-effort small business, or those looking for unique pens or pens specifically for pen spinning, will consider purchasing this. We welcome your questions.