HIGH FIN TUBE SUS FIN TUBE TITANIUM FIN TUBE STEEL FIN TUBE INNER RIDGED TUBE SPIRAL TUBE LOW FINNED TUBE HIGH FINNED TUBE CORRUGATED TUBE TURBO-E TUBE TURBO-C TUBE FLOWER TUBE HIGH FIN TUBE .. SUS FIN TUBE .. TITANIUM FIN TUBE .. STEEL FIN TUBE .. INNER RIDGED TUBE •INNER RIDGED TUBE(inner grooved 튜브 또는 inner.. SPIRAL TUBE •SPIRAL TUBE는 평관을 꼬아서 만든 것이다. •깊고 예리한.. [1] [2]