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