Amazon.com: Pilot Gel Ink Refills for FriXion Ball 3 Gel Ink Multi Pen & FriXion Ball Slim 038 Gel Ink Pen, 0.38mm, Black/Blue/Red Ink, 3 Packs 9 refills total Value Set :
6Pcs/2pack Pilot Erasable Pen Refills LFBTRF30UF For FriXion Gel Pen 6Pcs/2pack 0.38/0.5mm Black /Blue /Red Color School Office|Gel Pens| - AliExpress