This is Lina From Haining  Baoguang  Solar Energy Industry Co.ltd, China, our company holding a complete industrial chain of complete sets of solar water heater systems install with high quality and excellent efficiency solar vacuum tubes. For producing the solar vacuum tubes, We equipped with more than 40 automatic production lines for vacuum sputtering plating. Our annual production capacity reaches 15,000,000tubes. Currently we make co-axial structure vacuum tubes with outer diameter 47/58/70*1200/1500/1700/1800/2000/2100mm etc. Advanced absorption coating AL/AL-ALN(Single-target coated tubes) and CU/SS-AL-ALN(Triple-target coated tubes)are adopted for excellent efficiency. Borosilicate glass 3.3 is the basic material which made of all specification of our solar vacuum tubes. So the quality of solar vacuum tubes that our company produce are high and the price are competitive.