The Blue Spiny Koopa Shell also known as Koopa Shell, or simply Blue Shell is a usable item from the Mario Kart series that made its first appearance in Mario Kart 64. A fanart Mario Kart game progress bar for YouTube with The Blue Spiny Koopa Shell.
Green Koopa Shells are the shell of green Koopa Troopa that appear in many games of the Mario series and Mario Kart series. A fanart Super Mario progress bar for YouTube with Green Koopa Shell.
Red Koopa Shells are shells from red Koopa Troops that frequently appear in various Mario games and have the most impact in the Mario Kart game series. A fanart Mario progress bar for YouTube with Red Koopa Shell.