It all depends on how dirty the brass is, but it should last 15 to 20 cycles. You can get more life out of the media by adding 2"x2" squares of paper towels or used dryer sheets. Alot of the dirt will collect on them and you just throw them away and add new ones every each time you tumble more. I seperate the brass from the media outside because of the fine lead particles, be careful about that.
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