You usually don’t see stainless steel media used in vibratory tumblers. However, some vibratory tumblers can accommodate wet tumbling. As a rule of thumb, don’t use the same media for wet tumbling and dry tumbling. Stainless steel media is also a heavier media, and it might don’t do good for a vibratory case tumbler. Therefore, you should avoid using stainless steel media if you can.