Vinosol Wine Corks La Mancha 24x38mm 30-pack. Untreated. A cork should be slightly larger than the inside dimension of the bottle. This is to protect the wine from oxygen supply and bacterial infestation during storage, which should be done with a horizontal bottle, to keep the cork moist. This cork should not be heated in water. Use a cork device. A shrink cap gives an elegant and professional look.