... .Outer tank:Galvanized steel 3.Bracket:Galvanized steel 4.ce solar evacuated tubesell solar evacuated tube for home use1.Inner tank:SUS304/ 2BFood Grade stain ... .3 Three-target vacuum tube(58mm *1800mm). Hail resistance: 25mmsell solar evacuated tube with good quality.Certificate:SGS,CE,CCC,Solar Keymark,SRCC,ISO9001 certificate ...