Brass Aroma Diffuser / Aroma Inhaler. Carry your favorite scent with you. When you are out and about, or in the office When you want to relax, or just want to refresh yourself, Take out the small aroma diffuser and enjoy your favorite fragrance. *This product does not come with essential oils. ■How to use Insert the roller cotton into the diffuser while crushing it. (When you purchase the diffuser, it is already inserted and one spare roller cotton is included.) Put a few drops of your favorite essential oil on the cotton part and enjoy the fragrance. The cotton can be removed from the diffuser with a toothpick and replaced.