12 Pack 2 Ounce Boston Round Bottles with Screw-on CapsAmber glass for light sensitive liquids 2 oz. capacity, Pack of 12 bottles Rounded shoulder design Complete with black plastic caps 1 1 2 in. Diameter, 3 in. Tall Boston rounds glass bottles have a rounded shoulder design that has proven over the years to be one of the most reliable for containing almost any liquid or solid. Use Amber Boston rounds for light sensitive materials. Caps are a black plastic with vinyl liner.