Cork is an impermeable buoyant material. It is the phellem layer of bark tissue which is harvested for commercial use primarily from Quercus suber (the cork oak), which is native to southwest Europe and northwest Africa. Cork is composed of suberin, a hydrophobic substance.

The going rate is about 10 cents per cork. You can try to charge more if you have some type of rare cork you think is worth it, but if you just want to move your merchandise, price accordingly.

Here's a peek into how corks are made. First, a ​cork harvester carefully strips the cork bark from the tree. ​Then the cork bark dries out on pallets for several months. After drying, the cork goes into stainless steel tanks where it is submerged in water to be rinsed, cleaned and re-hydrated.

They are typically made from cork (bark of the cork oak), though synthetic materials can be used. Common alternative wine closures include screw caps and glass stoppers. 68 percent of all cork is produced for wine bottle stoppers.