Agglomerate Wine Corks 38mm x 23mm – 1,000pc pack. Economical and very good quality composite cork. This new technology wine cork has made these corks better than ever and easier to insert. This composite / agglomerate cork has a very high resilience and offers an excellent seal. Unlike natural corks which have natural imperfections which can cause leakage these agglomerate corks have a complete smooth surface offering greater consistency and safety.