The package consists of 18 reed sticks that absorb the scented oil and diffuse fragrance in the air that stays for long. The Aroma Reed Diffuser is a good idea for offices, home, hotels and most settings where candles aren’t permitted. Generally, one reed diffuser will be sufficient for an average room of 150 - 200 sq. ft. For large rooms and open areas, you can add another reed diffuser, or set out potpourri or oil burners from our collection.