双层玻璃upvc窗户

double glazed upvc window 1) hign quality hardware 2) double safety glass 3) high qulitypvc profilewith attractive design & manufactured by experience workers.they can open and close easily , smoothly and quietly. 4)excellent air tightness and wind pressure and excellent safety performance, welcomed by the majority of users. 5) with soundproof & heat insulation 6) we have many color for choose.