This one-piece grip cork is made of synthetic material (ExpanKork), which is very similar to a natural cork but has many more advantages. It creates a better seal, which, in turn, optimizes odor isolation. Further advantages of the synthetic grip cork are the clean and easy removal of the cork without it breaking and the cork?s resistance to mold growth. If this cork is used for commercial applications, it must be made tamper-proof in accordance with FPVO, e.g. though the application of a shrink foil (open at the top). This grip cork is not suitable for horizontal storage.