the newly made cartridge is 2x of converter capacity.
◆Eurekafp.com
◆Email: beatmaster90@naver.com
◆Instagram: MechGyver_Eureka
◆twitter.com/PenEureka
◆youtube.com/c/MechGyver
◆fountainpennetwork.com/forum/user/147641-the-fountainpen-researcher/
◆blog.naver.com/beatmaster90
◆facebook.com/profile.php?id=10005
