Beer Bottle Beer Savers are durable, stretchy molded beer bottle cap charms designed to help keep beer fresh after opening. They make a great gift for any beer lover. Home brewers can keep their beer bottles clean and sterile before bottling with these caps. Designed to help keep beer fresh and safe. Dishwasher safe and reusable. Made of food-safe silicone. Come in multi-colored sets of six. Fits Most Standard Beer Bottles And Some Larger Styles.