Our neutral, minimalistic Car Diffusers come pre-filled with 6mL of our high quality, proprietary blended diffuser oils that combine non-toxic and phthalate-free fragrance oils and essential oils to provide lasting fragrance for 30+ days Important: For liability reasons all customers need to be provided the instruction cards that are included. All essential oils and fragrance oils can be corrosive to plastics if spilled so proper usage is imperative!!