All our tumblers and goblets are made completely by hand. We do not use moulds or indeed rulers to get them right. This does mean that each one is different - that is the beauty of a set of hand made glasses, they feel different, each one has its own character. If you are looking for a perfect set of goblets, I am not your man, but if you are looking for a glass that you can have a heated discussion with then maybe you need to look no further.