The Sound Four were once known as the "Sound Five", as they were briefly forced to accept Kimimaro into their ranks due to his superior strength. As a group they specialize in barriers, defensive walls, and sealing techniques, causing Orochimaru to task them with protection-based jobs. Orochimaru has given each member of the group one of his cursed seals, which open their minds to his control, alters their appearance, and greatly increases their strength when active.