Cobalt Blue Glass Bottle holds 4 ounces and includes a screw on plastic cap with glass dropper. Good for light sensitive liquids. Great for storing tinctures, aroma therapy, herbal remedies, medicine kits and liquid vitamins. The rubber bulb on the outside of the cap makes dispensing liquids from the dropper easy and convenient. Dropper is not marked for accurate measuring, but will hold approximately 1ml of liquid. Dropper and bottle are non-sterile.