Dear Sir/Madam, We can offer SOLAR VACUUM TUBES with the following specifications: φ=47/37, 58/47, 70/58mm, and the length is 1200/1500/1800/1900/1920/1950/2000/2100mm. JINAN GT INDUSTRIAL CO.,LTD (GT GLASS) is a main manufacturer & exporter of BOROSILICATE GLASS TUBES, including SOLAR TUBES,and we have won good reputation in International market. Best quality, competitive price and prompt service is our core value. We keep Enough stock to shorten the delivery time, and select best logistic option for timely delivery which is important for customers. With years of experience in glass tubes, we have High Tech Production Line and Inspection Department to serve International Market.