Pentel Knock-Type Handy Whiteboard Marker Ink Cartridge 10 Pieces

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Pentel
XMWR2 [Knock-type Handy Whiteboard Marker Ink Cartridge] Black 2, Red 4, Blue 4

These will be listed together.
Since they are knock-type, you don't need to open and close the cap, making them very convenient for those who frequently use whiteboards.

★(Bonus)★
Pentel
[Knock-type Handy Whiteboard Marker, Round Tip, Medium Point] Black 2, Red 1, Blue 1

Other
I've set the shipping time to 2-3 days due to concerns about shipping, but I intend to respond quickly. I will use anonymous shipping.