An agglomerated cork that offers a great seal using compressed pieces of small cork. Fantastic value. Because they do not compress as easy as natural corks, you will need a floor corker, as opposed to a handcorker, to push these into the bottles.
This is my third order of Aglica corks. I use a floor corker and have not had a issue with these corks. Then go into the bottles with ease, no leakage. My wine is intended to last two years, I have no interest in aging it any longer. These corks are wonderful.