Airqon Naphthalene Balls 100Gm Naphthalene balls are round fragments of a white, solid substance that contain naphthalene. reduces unpleasant odors in restrooms and urinals. Prevent cockroaches from entering your home. Naphthalene Balls are only used to maintain the sterility of goods. They may also be used to block off odors near washbasins, sinks, and wardrobes.