This 3-pound package of 8/14 mesh untreated corn cob media is the exact amount of media needed for in a 10-inch vibratory tumbler bowl. It is great for cleaning and polishing brass cartridges. This metal cleaning and reloading media is meant for lightly tarnished brass, once or twice-fired. For heavily tarnished brass you will want to use walnut shell media. We have found that corn cob media works best in a vibratory tumbler but will do a good job in a rotary brass tumbler. Check out the video below to see how well corn cob media worked in Thumler's Model-UV10 vibrating tumbler.