In the United States the top of this bottle is referred to as a "Euro Dropper", designed for easy, exact measurements of liquids like essential oils, extracts and other chemicals. In Europe, it's simply referred to as a "vertical dropper". This 15 ml (.5 fl oz) dropper bottle provides the perfect storage space for food flavorings, essential oils and perfumes in an easy to carry design. Don't sacrifice bringing your favorite fragrance along with you on road trips, pour it into this conveniently sized dropper bottle and enjoy everywhere you go! The bottle is airtight and leakproof so it can be left in your backpack or daybag without leaking and making a mess. Ultraviolet glass stops light from entering and damaging your goods, while simultaneously allowing in UV and infrared light which help preserve and sanitize your products.