... Evacuated tube: absorptive selective sputtering, three targets: SS-C/CU and AL-N/AL, top grade in China ... Evacuated tube: Absorptive selective sputtering, three targets: SS-C/CU and AL-N/AL, top grade in China ... Evacuated tube: Absorptive selective sputtering, three targets: SS-C/CU and AL-N/AL, top grade in China, ... width: 100mm, thickness: 1.5mm7. Angle: 38 or 45 degree vacuum tube solar water heater