Iron ball
Big Steelies are large iron balls that appear in Super Mario World in the last battle with Bowser. He drops these from his Koopa Clown Car. Mario or Luigi can jump over them to avoid getting hit. Mario or Luigi can also spin jump on them without getting hurt. It can be destroyed if Mario or Luigi uses his sliding cape attack against it using a Cape Feather but it will show a glitched sprite.
In the Super Mario World episode "Send in the Clown", Bowser attempts to defeat Mario in one scene by dropping a Big Steely on him, which Mario dodges.
Bowser, with the same method, is shown dropping a Big Steely after Yoshi hits him with his Mechanic Koopa Troopas. Mario, however, uses a golf club and knocks the Big Steely at him.
Big Steelies also appear in Super Mario 64 and Super Mario 64 DS, in Bob-omb Battlefield, Tall Tall Mountain, Tiny-Huge Island, and, in the DS remake, Battle Fort. They come out of holes and roll in the ground. If Mario gets hit by one, he will lose two wedges of health. In the original game, they are indestructible, but they can be defeated with a punch from evil Wario or a Mega Mushroom in the remake.
In Mario Kart DS and Mario Kart 7, there are giant pinballs in Гuigi Pinball , which resemble the Big Steelies.
In the Mario Mania Player's Guide, they are referred to as "bowling balls".
A Big Steely being dropped from the Clown Car in the cartoon.
