Fragrance Reed Diffusers and Car Diffuser  Hand-poured in small batches using fragrance oil and essential oils to achieve a long-lasting flame-free fragrance. Each Reed diffuser will last a minimum of 3 months. Our car diffusers are a great way to keep your car smelling great and fresh. Forget those chemical-based air fresheners and try this toxin-free alternative! Choose from a number of fragrances and essential oils.