The Colmated (Bellcork) is one of the most popular corks. The Colmated wine cork is made of natural cork and then treated with a colmated process to fill the outer imperfections of the cork. This process combined with the surface treatmentgives the Colmated cork improved sealing ability. Recommended for storage up to 2 years. Suitable for use with the Vintner's Harvest Bordeaux Bottles (non-screw cap)