Now you can use your old essential oil vials to create your own natural spritzes and room sprays! These small spray tops fit perfectly on your used 5, 15, or 30 ml essential oil vials, or any other standard 5, 10, 15 & 30 ml size amber vials or other bottles with a 18-415 closure. Includes a clear plastic hood to prevent accidental spraying while transporting. *Note: Because some oils have the potential to clog the spraying mechanism, these spray tops are not guaranteed when used with oils.* Because this closure is meant to fit on different size containers, you may need to trim the dip-tube to the proper length to fit the specific container you are using. To do this, hold the spray top next to the container so it is about the same height as it would be if it were closed, and mark the tube just above where it reaches the bottom of the container. Use a pair of scissors to trim the tube to this length. Try the spray top on your container, and trim further if necessary to ensure a proper fit.