Precise Dispensing The precision-engineered dropper ensures every application is effortless and precise, allowing you to dispense just the right amount of serum for maximum effectiveness. Airtight Seal Crafted from premium glass, our serum bottle exudes sophistication while preserving the integrity and potency of your precious skincare elixirs. Non-Reactive Glass won't react chemically with stored contents making it ideal for essential oils and even pharmaceuticals.