Shell

Shells, or Koopa Shells, are a family throwable items present in the series, coming directly from the series. There are four kinds of shells, each one having its own unique properties, which are:
*Green Shell, a sliding shell that knocks everything on its path.
*Red Shell, a sliding shell that follows and targets on players.
*Yellow Shell, a sliding shell that buries players on contact.
*Spiny Shell, a flying shell that homes on the leading player, exploding on contact.