Glass Droppers

About

These glass droppers are the closure component — the rubber bulb and glass pipette assembly that turns your bottle into a precision dispensing tool. Each dropper ships wholesale, sold by the box, and fits Boston Round bottles in sizes from 0.5 oz up to 4 oz. You'll find standard droppers, child-resistant droppers, and graduated glass pipette options across four finishes: black, white, gold, and silver. Whether you're filling tincture bottles for a CBD brand, assembling skincare kits for a private label line, or sourcing closures to go with an existing bottle order, this is the page for that. Pair these droppers with our glass dropper bottles for a complete, ready-to-fill setup, or browse compatible caps and closures to round out your packaging line. Need to test a fit before committing to a full box? Check our samples collection . What the Dropper Assembly Consists Of Every glass dropper here is a two-part assembly: a rubber bulb on top and a glass pipette stem below. Squeeze the bulb, insert the pipette into your liquid, release — the pipette draws up a controlled amount and holds it. Squeeze again to dispense drop by drop. It's an old mechanism, but it's still the most accurate way to deliver small volumes of liquid without waste. The glass pipette is inert — it won't react with essential oils, tinctures, serums, or herbal extracts the way plastic can over time. That matters when your product is potent or has a long shelf life. The rubber bulb provides the suction; the pipette controls where it goes. Together, the dropper and pipette form a complete dispensing system designed for daily use by your end customer. Neck Finish and Bottle Compatibility These glass droppers are sized by neck finish — 18-400, 20-400, and 22-400 — which tells you both the thread diameter and the thread count. The 18-400 fits our 0.5 oz Boston Round bottles . The 20-400 covers the 1 oz and 2 oz Boston Rounds , which are the most common sizes for tinctures and serums. The 22-400 fits the 4