The Tumbler is a beautiful bottom coil tank made by Smoktech. BCC tanks unlike top coil tanks do away with having to tilt the tank, dry burns and wicking issues. The tumbler tank, like other Smoktech tanks have fantastic vapor production, throat hit and clean flavor. The tumbler has a replaceable coil unit, once the coil stops working simply unscrew it and screw in a brand new coil and wick unit!