These look quite good, i looked at them when i was in the market, I'm no expert though! Rubber barrels are meant to last longer. i'd email them and confirm they can be used for wet tumbling, only thing to be wary of is import duty which could bump,the cost up. The media isn't the cheapest but lasts forever if you buy decent pins, buy appropriate length for the calibres (my 6.5 mm pins get lodged in 6.5x55 case necks and .22H bodies, should have got 5 mm)