Stainless steel Enhance your journey with this unique aromatherapy diffuser. Select your favorite essential oils or blends and experience their positive health benefits while driving. The designer locket contains a felt pad that can hold a few drops of oil. Attach it to your car's air vent to allow the fragrance to diffuse. The locket is made of high-quality stainless steel and comes with 10 washable, reusable, absorbent felt pads in a variety of colors. Now you can control the fragrance in your car. -Access your car with unique jewelry -Choose your own scent to suit your mood -Includes 10 colored fragrance felt pads We recommend our pure essential oils or blends. The Car Diffuser kit holds 10 ml of essential oil.