Discover Our Best-Selling Car Diffusers: Perfect for Your Store! These trending car diffusers are a hit on social media, and they'll fit right into your retail space. An easy to grab item at the checkout counter – it's that simple! Each diffuser comes with a handy how-to-use card. Filled with and organic carrier oil; almond oil and a phthalate free fragrance oil. Mini Diffusers are 6ml