Used once or twice with my cricut cake machine. Booklet, overlay, cartridge and box present, see pics.

I see a lot of listings saying they are linked or unlinked and honestly I have no idea what that means, even after googling. I only have a cricut cake machine and the cricut design studio software that I used like twice with one or two of the 50+ cartridges I have. All cartridges but one were purchased brand new, so I am guessing it is unlinked?

Ships in bubble mailer.