Our natural agglomerated beer cork, in medium wash, is comprised of an agglomerated body constructed with natural cork particles. There is homogeneous efficiency in all cork granule sizes. The consistency and natural appearance of the granules is preserved without cellular structure destruction. Agglomerated corks undergo the NEO TECH® process to render TCA undetectable. This process is Ecological and sustainable, using no chemical solvents, only controlled pressure and steam. Only FDA food-grade bonding agents are used on our technical and agglomerated corks. This technical cork stopper is designed to hold pressure associated with most carbonated beers, and is sized to hold that pressure securely in the beer bottle. Did you know? These natural corks actually have a negative carbon footprint?