Type: E5-58/1800-16 Outer tank: Al-Zn sheets Inner tank: SUS304-2B stainless steel Insulation: polyurethane, 55mm Absorptive coating: AL-N/AL Vacuum tube: Borosilicate glass,diameter: 58mm, length: 1.8m, 16pcs. Frame: aluminum alloy Absorber area(¬O): 2.0¬O Volume tank(L): 135L. Carton.