... black, golden, brownAlumina ceramic plate polishedAlumina ceramic plate sintered at very high temperature, and its surface is polishedLong ... as black, whiteAlumina ceramic plate glaziedAlumina ceramic plate sintered at very high temperature, and coat a glazing ... littleTourmaline ceramic plateTourmaline and some additive powder, is sintered and processedLong life, ion can be generated itselfLower ...