... walnut,,etc.)100% opening,largest space,Freedom from noise,dust and pollution,Easy clean,Superior aesthetics2.Profiles:LG of Korea, ... .Sealing system:rubber sealing strip-EPDM, black color, good quality.8.Frame material:Aluminum or PVC,60 series9. ... .Characteristics: Easy folding; Good performance in heat insulation, soundproofing and waterproofing; Save more house space and widen your vision; Can ...