Natural corks and composite are commonly used in red wine, champagne, sparkling wine, etc. they are made of imported raw materials or composite materials Natural corks are commonly used in red wine, champagne, sparkling wine, etc. Cork has long been considered the ideal wine cork. It should have moderate density and hardness, good flexibility and elasticity, and certain permeability and viscosity. Once the wine is bottled, the only channel for the wine body to contact the outside world will be guarded by a cork.have multi size to choose.