Amazon | Pilot FriXion Ball Slim Retractable Erasable Gel Ink Pens, Extra Fine Point, 0.38 mm, 20 colors set (Japan Import) [Komainu-Dou Original Package] by Pilot | ジェルインクボールペン | 文房具・オフィス用品
Pilot Frixion Ball Slim Gel Pen 0.38mm 6pcs/lot 20 colors available Black/Blue/Red/Green/Violet/ Writing Supplies LFBS-18UF - AliExpress Education & Office Supplies