Big Steely

Big Steelies are enemies in Super Mario 64. They appear in Bob-omb Battlefield, Tall, Tall Mountain, Tiny-Huge Island, and the DS remake's Battle Fort. They are large cannon balls that usually roll down paths.

The Big Dud
In Bob-omb Battlefield, 2 Big Steelies are rolling around at the bottom of the mountain. After Big Bob-omb is defeated, a third will appear. A Bob-omb Buddy states, "Thanks to you, Big Bob-omb is nothing more than a big dud now."