PVC combination windows and doors: PVC windows and doors, good quality and favorable price. Elegant appearance. . PVC profiles: 1>Brand: LG,Conch, Gudi, Gaoke, VEKA,etc ... , laminated glass, argon gas gass, etc.3. Glass thickness: single, double, tripled 5mm, 6mm, 8mm; Space: 6, 9, 12, 16mm.4 ...