Ink Cartridge For Fountain Pens KIWAGURO

万年筆用カートリッジインク 極黒（きわぐろ）

list price $4.24

Photo from a Rakuten Ichiba listing. View the listing Ad

“Ink Cartridge For Fountain Pens KIWAGURO” — Ink from Sailor. Status: In production. 1 part numbers recorded. List price $4.24 (incl. tax). View Japanese page

See photos on the official site