Don't use 4 or 5 COOPERS drops in 12 or 24 ounce bottles. Those are the muntons tabs. The muntons tabs are small, so that you can easily get a different level of carbonation if desired, or if you're using an odd sized bottle. Coopers drops are meant for 12 and 24 oz bottles, so only use one for a 12 oz and 2 for a 24. The coopers kit comes with 30 750ml bottles, and they tell you to use 2. I personally think they work great. They carb up in a week, if you're doing a low to medium gravity beer and leave it in 65 to 75 degree ambient temperature. They're perfect for coopers kit users because they only give you one fermenter, so when bottling straight from the fermenter, it's easy to just drop 1 or 2 in a bottle and fill it with beer. If you have a second bucket that you can bottle from, then you have more options with priming sugar.