Bowser's Shell

Bowser's Shell is a Special item first appearing in Mario Kart: Double Dash!! that Bowser and Bowser Jr. can receive. Much like any other Special Item, King Boo and Petey Piranha can also receive it in that game. It is a gigantic shell that, when released, bounces around the track like a normal Green Shell, toppling any kart that it hits as well as knocking down the rear character, making the racers drop their items and temporarily disabling them from switching.

After Bowser's Shell hits the walls of a course roughly fifteen times, the shell breaks apart. Unlike many other items, the Bowser Shell can resist being destroyed by some other items, and even bounces off another special item should it collide with one.

The item reappears as one of Bowser's items in Mario Kart Arcade GP 2 and as an item any character can use in Mario Kart Arcade GP DX.

This item was also going to appear in Mario Kart DS, and the model for it is still in the game.

This item also reappears in Mario Kart Tour as the special item of Bowser, Bowser Jr., and Dry Bowser.

Mario Kart Tour

 * Tips & Tricks: "This big ol' shell on loan from Bowser will crash any karts it hits and keep on going. It can only be thrown forward."
 * Mario Kart Tour Twitter: "Special item introduction: Bowser's Shell In blue, there are special items for certain drivers. This big ol' shell will crash any kart it hits and keep on going. In tightly-packed races, this powerful item can take out multiple racers in a single throw!"