The title of this article is official, but it comes from a non-English source. If an official name from an English source is found that is not from the English Super Mario Bros. Encyclopedia, the article should be moved to its appropriate title.
The Hone (骨, "bone") is a power-up that only appears in one chapter of Super Mario-kun volume 1 as one of the hypothetical items that would appear in a future game.
It is released by a skeletal Galoomba after being squashed. When Mario grabs it, it turns him into Skeleton Mario for three minutes.