The diffuser is suitable for cars. It can be clipped to the air vent. The glass contains 8ml of fragrance oil. CocoPearl uses pure fragrance oils to maximise the scent throw. The diffusers throw the scent much stronger than any car air fresheners. The fragrance oils are manufactured at our in-house perfumery in New South Wales. High-quality ingredients sourced both locally and around the globe. Stringent quality control and testing ensures the highest standard of fragrances are produced. The fragrances are vegan-friendly and free from parabens and phthalates. Simply open the fragrance barrier to relieve the scent. Put the wooden lid on, put the wooden sticks in and clip it to the vent.