guala closures group, along with lyonbased manufacture génerale de joints mgj has developed a new range of liners with different levels of oxygen permeability rates for the wine industry, utilisng oenosealbranded technology.the technology extends across all the guala closures screwcap family for wines.currently, the range includes onyx which is an aluminium layer to ensure maximum impermeability to oxygen ivory which is best suited for white, rosé and red wines that require a low, but regular, supply of oxygen and coral that is also designed for white, rosé and red wines which require a more significant supply of oxygen.while the onyx range has been designed to ensure sulphitefree wines, ivory helps in reducing the amount of free so2 during bottling.coral helps to avoid reduction problems for wines with high tannin levels.guala closures group ceo and chairman marco giovannini said "not only can producers now take advantage of the wide and available range of screwcaps that we offer under our wine developers platform, including all the branding customization that our patented technology allows but they can now also select the exact liner for the exact wine. and all without changing the settings on their bottling lines.""we&39ve taken our time to make sure the wine developers concept is just right and offers the high performance that our customers have come to expect from our screwcaps."the company specialises in producing nonrefillable and aluminium closures for spirits, wine, oil and vinegar, water and beverages, food and pharmaceuticals.operating in five continents through 25 production plants, guala has a sales network covering over 100 countries. 
