For beer styles requiring extended aging periods, Oxy Caps prove beneficial for bottling styles intended for cellaring, such as high gravity Belgian ales, Barley wines, Imperial ales or any style with high alcohol content. Caps absorb oxygen remaining in the headspace following bottling. Each bag contains enough caps to bottle three 5 Ã¢â‚¬â€œ gallon batches while using 12 oz. bottles or 4 batches using 22 oz. bottles.