I have ordered 2'000 of these corks. When I showed them to the winemaker he already told me "they look risky", so I went to show them to a specialist and he again said "risky". Being extra careful I ordered now new ones from the specialist but I still wonder if these ones are safe to use for a later batch. What makes my case special is, that the bottleneck is not completely round inside, so when you put the cork in it, a tiny bit of wine can get up to 15mm up and around the cork. What do you guys think?