2, acorns because the interior is filled with many honeycomb structure, the interior of the honeycomb is full of air, so the elasticity of the oak is very good. Oak itself is very wear-resistant, many of the national engine cylinder gasket using oak as a raw material.
3, in addition, oak moisture-proof, insect-proof, can ensure that the wine in the dark and humid cellar will not pass with the years. This natural material, no harm to the human body, so it is widely used in the production of wine and champagne corks, which has a history of more than a hundred years.