Nomacorcs are made by a unique, patented, co-extrusion process that binds the interior and exterior sections of the cork by heat adhesion. Extrusion molding is a continuous process that provides a very consistent quality, and every cork is exactly the same. Nomacorc is a better cork because its uniform, small, closed cell structure creates a better barrier from oxygen and preserves the quality of your wine. The cork seals instantly, allowing wine bottles to be immediately inverted and stored. These synthetic corks are commercial quality corks used by many wineries. Many say that it is much easier to use these corks with a floor corker. Size is #9 x 1 1/2".