A perfect size for travel or for your purse. Bottles are cobalt blue in color and meet apothecary standards for preserving essential oils. These small 1/4 dram (.9 mL, .03 fl oz) essential oil tester bottles are a great way to offer samples of multiple oils, blends, and fragrances. These 24 cobalt blue bottles meet the apothecary standards for preserving the contents. What's included: 24 cobalt blue bottles for protection against harmful UV rays that will degrade your oil. 24 orifice reducers that help with reducing flow upon transferring your essential oils. 24 caps for the bottles. 60 Blank Labels.