We use fragrance oils in our products that are made from a combination of essential oils, synthetic aroma chemicals, and aromatic resins. This means that they are not all natural but do have some aspects of essential oils.The main advantage of our fragrances over the other products out there is the fact that they are phthalate free.If you would like to use your own essential oils, you have the option to buy the "Wooden Tag Only" on all of our air freshener designs.