The Coopers Carbonation Drops are designed to make your bottling time easy. These drops are specially formulated for carbonating your beer and will leave no off flavors in your beer. These drops are perfect for bottling your next batch of beer from your Coopers DIY Beer Kit. These carbonation drops are a must have for every home-brewer. Use 1 drop per 375 ml bottle, or 2 drops per 750 ml bottle to carbonate beer.