Precise dispensing is what you get when you use this 4 oz. Clear Boston round with black dropper When just a few drops is all that's needed to get the job done, this 4 oz. clear Boston round glass bottle with black glass dropper is the perfect choice. The glass dropper makes it possible to dispense very small quantities to reduce waste and ensure precise dosing or application. Stylishly designed with its easy-to-twist black cap, this glass bottle is perfect for professional packaging, as well as homemade product storage and dispensing.