Giant Green Shell

From the Super Mario Wiki

Giant Green Shells are items found in many Mario Games. In Super Mario Bros. 3, Mario or Luigi could jump on a Gargantua Koopa Troopa, who would then hide in its Giant Green Shell, or Giant Red Shell.

The Giant Green Shell made a return in Mario Strikers series, as an item. Working similarly to the Bowser Shell item from Mario Kart: Double Dash!!, when used, they will shoot out towards the opposing players. Even after it hits a player, the item then continues to bounce around the stage until, at last, it wears out, and falls apart.

Mario Strikers Items
Banana | Giant Banana | Green Shell | Giant Green Shell | Red Shell | Giant Red Shell | Blue Shell | Giant Blue Shell | Spiny Shell | Giant Spiny Shell | Bob-omb | Giant Bob-omb | Chain Chomp | Mushroom | Star

Shells
Green Shell | Giant Green Shell | Red Shell | Giant Red Shell | Triple Shells (Green · Red) | Blue Shell | Giant Blue Shell | Yellow Shell | Spiny Shell (Mario Kart) | Giant Spiny Shell | Black Shell | Bowser's Shell | Gold Shell