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Bros. Items are special items used by Mario, Luigi, Baby Mario, and Baby Luigi in Mario & Luigi: Partners in Time. Bros. Items are different from regular items in that they are used for attacking one or multiple enemies at once (oftentimes with a specialized jump attack), and depending on the item, they require at least two characters or all four characters to be active in battle when utilized.
Bros. Items replace Bros. Attacks from Mario & Luigi: Superstar Saga and its 3DS remake, though they are replaced by Special Attacks in Mario & Luigi: Bowser's Inside Story, its 3DS remake (Special Attacks being renamed Bros. Attack in the latter), and subsequent Mario & Luigi games.
List of Bros. Items
The table below shows the Bros. Items available in the game, along with the number of bros. required to use each of them: