4 oz clear boston round bottle with 22/24-410 neck finish. 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, good chemical resistance, high impact resistance, and medium rigidity. It is also light-weight and is used for products containing essential oils. Avoid using containers to store products that contain essential oils greater than 5% or fragrance oils greater than 15%. If your oil percentages exceed these respective levels, please consider using glass. This item has a 24-410 neck finish. The first number refers to the diameter (in mm), and the second refers to the closure depth, style and thread. This container can be paired with a closure with a matching finish. This container is clear, making it an ideal display container for your product.