I previously had tried another brand of these, the orfice reducer would slowly pop up on almost half out resulting in only half of the bottles being useful.
I was glad when I was contacted by the company to try these at a discount or free for an honest review of the product. I have not had one single issue with this brands bottles.
The orfice reducers snap in perfect and stay there. I have found my new supplier of glass bottles, they have proved to me they have a quality product that is ready to use as soon as they arrive.