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I can fit 15 lbs in a standard flat rate box so the more you buy the more you save on shipping..
Use this 80 grit rough for the first stage in sahping rough rocks, or use it to remove rust from nuts, bolts and other fastners..You will get just over 5 lbs of media and a standard 3 lb tumbler will use 4-8 ozs a shot depending on what your doing.