A basic Bomb Bell's main body is circular and resembles a classic alarm clock. It has three short, conical spikes on its sides—two near its base and one on its top—and has two mushroom-shaped protrusions on its top. It has two "arms" on either of its sides, and one long, thick "tail" attached to its base. Its face is navy blue and adorned with a white Nobody emblem, but the rest of the Bomb Bell is yellow with sky blue highlights. All of the spikes on its body are navy blue. During the battle with Xemnas's draconian form, a version of the Bomb Bell appears that is colored in metallic shades of steel blue and sky blue. There are also red and gold versions of this Nobody.
The Bomb Bell's name references its explosive capabilities. "Bell" reflects its alarm clock-like shape. Its Japanese name, Floating Mine, again refers to its ability to self-destruct.
When they appear, they hover on screen for a few seconds, then close in before detonating. The best strategy used to defeat this Nobody Ship is just to wait not long after it appears, for other Enemy Ships to come close. Once they are close, shoot the Bomb Bell and it will explode, destroying most other Enemy Ships with it. Be quick though, because they might explode before Sora gets a chance to defeat it, so it will deal a fair amount of damage. This strategy is most useful when battling waves of Gummi Ship Enemies. The Red and Gold versions drop treasures when defeated.