This 50 ml option is the largest bottle we offer in the euro dropper style. The green glass bottle is paired with black tamper evident caps containing orifice reducers. When installed into the bottles, the orifice reducers allow gradual product dispensing. Once the cap is screwed completely on the bottle, the orifice reducer will remain snug in the opening, ready for use. The tamper evident ring will detach from the rest of the cap when the essential oil bottle is first opened for added security.