Cobalt blue glass Dropper Bottles have a 60 cc (about 2 fluid oz.) capacity and come complete with a glass pipette and plastic bulb. Cap screws shut for a tight seal. These glass dropper bottles have an endless amount of uses. They are great for scientific, herbal, cosmetic, aroma-therapy, medical, and custom craft uses. Cobalt blue glass color protects sensitive liquids from light. This will provide better stability and shelf life of the material stored in these bottles.