Black Shell
Black Shells are shells of unknown origin that appear in the Mario Kart GP series. Its effects are similar to that of a Winged Spiny Shell, though unlike a Winged Spiny Shell, it can only be fired straight and has a higher appearance rate. It is possible that these are the shells of a Bombshell Koopa, as they are both black and they both explode. They can also be used as a triple if unlocked.
Some evidently high-ranking members of the Koopa Troop, such as some Fire Bros., Black Ninjakoopa and Lakithunder, are shown to wear non-exploding Black Shells. Additionally, in The Super Mario Bros. Super Show! Koopa Troopas, Lakitu and Hammer Brothers were portrayed as wearing, as the episode "Mario and Joliet" showed, fire-proof Black Shells.
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Trivia
[[1]]Pac-Man World Rally - The Black Pac-Bomb in this game is similar to the Black Shell. This is the same with the Green Shell, Red Shell, and Blue Shell, which are all similar to their respective Pac-Bomb companions.