... 2.heat insulation 3.watertightness, windtightness,airtightness aluminum cad window :1.frame material: upvc\pvc\palstic\aluminum\aluminum alloy.etc2.glass material: single, double, tempered ... ) and NOTO(made in Germany)5.sorts:sliding window,casement window,hung window\title and turn window.etccolor:white, red, green, grey, gold and so ...