The permeability of the SÜBR closure is 0.25 mg of O2 per year. It’s a perfect solution for wines with high aging potential, but it also helps preserve the aromatic freshness of delicate wines and wines ready to drink. The real strength of SÜBR lies in the uniformity of this permeability value from one closure to another. This uniformity is made possible by the extrusion process used in its manufacture. We are the only closure producers to use this technology, which we have mastered for over 25 years. In practice, extrusion involves producing a rod cut into pieces of 38, 44, or 49 mm. In contrast, during the molding process used in the production of micro-agglomerated corks, the pressure applied to bond cork and glue varies. The lower the pressure, the greater the variability from one cork to another. This constraint is overcome with the extrusion process.