Thank you for your interest. This is a promotional item and is not for sale. It is new, unopened, and unused. It is now rare because it was for Hakuhodo DY Media Partners, which no longer exists due to integration, and only Hakuhodo remains. This is official merchandise with the Hakuhodo DY media partners logo, and it is a light green Frixion Ball Knock pen from Pilot (PILOT). It's light green, so I think it's a pale green color. It also comes with one refill. Since it's new and unopened, how about adding it to your collection? I think it's very rare and valuable for advertising industry fans and official merchandise fans. It's also unusual that it hasn't been opened. I think it was made for the 10th anniversary of Frixion. The logo is on the back of the package. This is a Frixion pen, not a ballpoint pen, so please be aware of that. Thank you. It's the Pilot "Frixion Ball 05". "Frixion Ball" is a ballpoint pen that can erase writing with friction heat. "05" indicates that the ballpoint tip is 0.5mm. It doesn't produce eraser shavings, and you can rewrite in the same place as many times as you like. It's suitable for use in planners, notebooks, etc., where you need to rewrite easily. Quoted from Google AI: Pilot's erasable ballpoint pen "Frixion Ball Knock 05" light green * Uses special Frixion ink, and by rubbing it with the special rubber on the back of the pen, friction heat is generated, and the ink becomes colorless and transparent, erasing the writing. * With a 0.5mm extra-fine ballpoint tip, it is suitable for writing in small areas such as planners and documents. * Green is one of the many color variations of the Frixion Ball Knock. Novelty, promotional item, company merchandise, official, not for sale #Frixion #PILOT #FRIXIONBALL #LightGreen #05 #Refill