Thumlers Tumbler Model B rotary tumbler offers up to 15lbs capacity and the ability to do larger stones. Its professional quality steel barrel & rubber liner offer very quiet operation for a 15lb tumbler. It sports the largest motor Thumlers Tumbler has to offer on their rotary tumbler line. A great tumbler for any hobbyist or professional for tumbling stones, brass reloading or countless deburring projects. This item comes with 12lbs of our Medium mix as well as a grit pack and a jewelry kit so you can tumble and enjoy your first batch.