The Shower Stack has 8 eucalyptus menthol steamers giving you the ability to choose how much aromatherapy you'd like! Use 1 cube for a mild scenting, 2 or more for increased therapeutic effects. Place cubes in indirect stream of water and breath deeply as the essential oil blend of eucalyptus, peppermint and menthol refresh and invigorate your senses. Great for getting you going first thing in the morning, post-workout shower or when you're feeling under the weather. Awesome for opening sinuses and clearing congestion!