Board Master S Exclusive Direct Liquid Cartridge (Various) and More

Please be sure to read my profile.

I purchased these as spares in 2023, but no longer need them, so I am selling them.
How about using them for visualized schedule management with a whiteboard?

[Details]
Board Master S Direct Ink Cartridge for Whiteboard
?Black: 7
?Red: 3
?Blue: 2
Board Master S Black Main Unit: 1 (New)
Pentel Knockle Green Whiteboard Marker
New x 1, Used twice (approx. 20 characters total) x 1