Main material SPCC,SPCD or other similar material steel strip. SPECIFICATION mono layer tube: OD8*0.7 OD6.35*0.7 OD6*0.7 OD4.76*0.7 OD8*0.65 OD0.35*0.65 OD6*0.65 OD4.76*0.65 OD8*0.6 OD6.35*0.6 OD6*0.6 OD4.76*0.6 double layer tube OD8*0.7 OD4.76*0.7 Performance Tensile strength above 290MPa Elongation above 20%, Yield strength above 180Mpa