1) Glass shrinkage: it is very different that the size and shape of the bottle that from mass production with the size and shape of the bottle drawing. This is caused by the cooling shrinkage of glass or ceramic. Sometimes the inner bottleneck will become funnel-shaped, flared, waist drum, wasp waist, and so on.
2) We will choose a suitable diameter and length of the cork stopper to fit your bottleneck according to the actual diameter and shape of the bottleneck.
3) If you only show us a bottle size drawing, we can’t choose a suitable cork to fit your actual bottleneck.
4) For the same bottleneck, the diameter of cork is different from different cork manufacturers, because the cork is different hardness.
5) If you show us a stopper size and color, which is just for us to refer pattern and color, we must look at the actual the size and shape of the bottleneck and original cork stopper if you have it in your hand.
As the saying goes: more haste, less speed! Express mail us bottles. We'll return it to you as long as you specify it.