Champagne corks start life with a cylindrical shape. The bottom third is inserted into the bottle, leaving the remaining two thirds protruding, to be compressed when the wire muzzle (cage) is applied. With time the corks take on the familiar mushroom shape.
Dimensions 48mm high x 30.5mm diameter - with two natural cork discs and agglomerate top
Note: It is not usually possible to use a conventional corking machine for champagne corks.