... .Chambers: 3, 4, 5, 6, 4.Thikness:2.5MM Plastic sliding windows/doors ; excellent quality;energy efficient&safety; acoustical insulation. 1 ... . PVC profiles: 1>Brand: LG,Conch, Gudi, Gaoke, VEKA,etc. 2> ... . Place of origin: Guangzhou City, GuangDong Province, China. European style pvc sliding window