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Description:True and well-know producer in China. Output: under the trademark "Xinyu", 20,000metric ton aluminium alloy extrusion every year. Usual AA. NO.: 6005　6060　6061　6063　6082　6101　6105　6262　7005 Temper: T3　　T4　　T5　　T6　　T8 Feature: 1) The sliding window of energy-efficient material, absorbing the quintessence of the energy-conserving window technology from America and Europe 2) The window material is high, firm, safe and durable in intensity 3) Rational design, good heat-insulation, sound-insulation 4) Can be installed with the double-deck glass of 5 + 9 + 5 Pls feel free to contact us. Other aluminium alloy and temper are available upon your great request.