The boston round bottle is distinctive in its classic shape. Characteristic of the boston round are its rounded shoulders and rounded base. Glass has high clarity, can be colored, has high chemical-resistance levels, and has extremely high resistance to heat and cold. It is great for storing essential oils. All glass at containerandpackaging.com is lead free. This container is clear, making it an ideal display container for your product and the clear glass construction showcases contents and labels with ease. contents and labels with ease.