Colmated corks are from medium-grade natural cork, with the natural defects in the cork filled with fine cork powder. These are sound enclosures for up to five years.

The product line also includes colmated corks, agglomerated corks called Francork, 1+1 “technical” cork stoppers and bar-top corks.

There are currently two types of SmartCorks available in the range: Reference 3 natural cork and colmated cork. Both come in two sizes: 44mm length x 24mm diameter and 38mm length x 24mm diameter.