This great add-on features a jet pack that is an add-on and upgrade kit for Roller/MP-10 Optimus Prime (both sold separately). This version is for the Japanese release of MP OP. This is a 3rd party add-on not associated with Hasbro or Takara.
The jetpack fits almost perfectly in MP-10's back. I like the moving nozzles very much. Looks awesome on Prime, even if it is a bit chunky.
As for roller's acecsories, they look quite nice on it and upgrades it a lot.
A mint box generally has no noticeable flaws. This doesn't mean it is a C10 box, but that it doesn't have any significant damage to the box. It still may have wear to the window, and a small amount of wear to the box that is noticeable upon close inspection.
A C9 box is still considered very displayable and may have a kink, ding, minor fray to an edge, etc. The box is still case fresh and unopened with factory sealed tape on both sides.
By selecting this option, TFsource allows you to continue to add either instock or preorder items to your stack, as well as change how your orders ship out, which can save you on shipping!