This 2 oz cobalt blue glass boston round bottle has a 20-400 continuous thread neck finish. It is a great option for your favorite aromatherapy or fragrance oils. This 2 ounce bottle can also be used for extracts, dyes and other liquids. The blue color of this classic bottle style provides some UV filtration helping light sensitive products last longer. When paired with any of our matching items below, you can really maximize the potential on this 2 ounce bottle to best suit your specific needs.