Black Coated 1oz UV Resistant Dropper Bottles, Great Dropper Bottles for Essential Oils and Aromatherapy (6 Pack) This 6 pack of black powder coated amber glass 1oz dropper bottles are the pinnacle of essential oil and essential oil blend bottling. These essential oil amber dropper bottles features a black coating on the exterior of their amber glass that works to keep out UV light to ensure your oils don't lose their healthy properties. A 6 pack of glass dropper bottles in 1oz are amazing for any DIY Aromatherapy Application. 1 ounce = 30 milliliters, BPA-free droppers, lead free bottles, medical grade, food-safe. rubber bulb glass tube eye droppers included.