Pentel Fude Pen Pigment Ink Cartridge Set of 8 ① 〇Pentel Fude Pen Pigment Ink Model Numbers: FRP-A (Old Model) 5, XFRP-A (Current Model) 3 Compatible Products: XFP5M (Medium), XFP5F (Extra Fine) Unscrews with a clockwise rotation These are deadstock items I received from an acquaintance who owns a stationery store. They are unopened and unused, but have been stored for a long time, and the packaging shows some clouding, etc. I do not own the pen body, so I have not been able to test them. Please understand this before purchasing.