8 ml car diffuser! This car diffuser works like a reed diffuser in your car. Take off the plastic stopper, tip it a few times to wet the wood top with oil, and hang in your rearview mirror in your car. Top is wood, bottle is glass. I only use clean fragrances and it is DPG free, no dyes, and non-toxic and the solution is biodegradable. Intention is put in each car diffuser. There are 4 different intentions that is curated with fragrance, herbs, crystals, and reiki. Adore - for love - english garden fragrance, rose petals, garnet Uplift - for uplifting energy - citron and mandarin fragrance, chamomile, and citrine Cleansing - to cleanse your energy - white tea fragrance, lavender buds, cedar leaf, and quartz crystal Clarity - for mental focus and clear messages from spirit - Peppermint Eucalyptus fragrance, green tea, chamomile, and quartz Vanilla - for peace - very vanilla fragrance, chamomile, amethyst Shield - for spiritual protection Ambrosia - for enlightenment