4 oz blue glass boston round bottles sold here with no caps included are offered in bulk quantities for wholesale pricing. The cobalt boston round bottles have a 24/400 neck finish to match with a selection of closures, are impermeable, and reusable for compatible use with a range of products. The glass boston round bottles are impermeable, preventing product alteration, and feature sloped shoulders and a narrow neck. Blue glass provides adequate UV protection, assisting with keeping your light-sensitive products maintained when storing. Test these blue boston round bottles with your products to ensure the top experience for customers.