Specification: 1.Flowering tube : copper with 11mm diameter ,and 0.7 mm thickness. 2.Head tube: copper with 25mm diameter ,and 0.75mm thickness. 3.Cover glass: tempered glass with 5mm thickness. High translucent ,good insulation, tightly for long time. 4.Bottom insulation: rock wool with 30mm thickness. 5.Side insulation: foam 6.Thick back sheet : galvanized steel sheet 7.Frame: aluminum alloy 8.Working pressure: 0.6MPA 9.Treated with special heat preservation: reduce the hot loss , and more efficiency absorb ,more beautiful. 10.Install easy ,resistance 10 stage wind power 11.Sealing rubber strip : the special and processed rubber material ,life span is long ,water tightness avoid infiltration. 12.Aluminum metal alloy layering : smooth rubber, no infiltration.