Oxybarrier is a higher end PVC free liner which totally seals off the bottle. This means, what's in it stays in and nothing comes in or out; leaving the beer fresh for about 3 months longer than a regular PVC free liner. This liner is commonly used for lower rotation, high end beers which are bottled in a near perfect environment. In a nutshell, if you have a good filler and the oxygen is near 0 when the cap goes on, then this liner is the best of the best.
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I've been using these little caps for a couple of years now in many colors and I can only say I'm very pleased with them. I have used hundreds of them and never have I ever seen a defective one. I'll keep buying them for the years to come.