A dozen 3ml Plastic Droppers (pipettes) - The 3ml size is graduated in 1/2 ml increments and draws up to 3ml. It can easily dispense 1 drop at a time. We recommend using a separate dropper for each essential oil. Note: our 5ml, 10ml, 15ml and 1oz bottles of essential oils include an internal dropper so these plastic droppers are not necessary. But, for larger sizes (2oz or larger), you'll need droppers. For Essential Oils, we do NOT recommend the use of glass droppers with a rubber bulb. The essential oils causes the rubber to deteriorate rapidly. Our plastic droppers are not impervious to the essential oils but usually last for years, especially if you occasionally clean them with alcohol and let them dry out. Helpful hint: attach each dropper to it's bottle with a rubber band - that way you do not mix your essential oils. Sold only in groups of a dozen.