Frankford Arsenal Corn Cob Brass Cleaning Media has been designed to quickly and efficiently remove dirt, grit and powder residue from brass cases before reloading to keep reloading dies in top working condition. Media can be used repeatedly, but should be replaced periodically for optimum performance. Sieve Size: 16/20 Notes:4-1/2 lb Jug is Approximately 4-1/2 lbs of media packaged in a plastic jug7 lb Bag is approximately 7 lbs of media and is packaged in a plastic bag15 lb Bag is approximately 15 lbs of media and is packaged in a plastic bag15 lb Bucket is approximately 15 lbs of media and is packaged in a plastic 3-1/2 gallon utility bucket