https://vigwindows.com/product....-VHD105-double-hung-

Dual thermal bridge American style aluminium hung windows ,equipped with hybrid vacuum insulating glass,and world class Caldwell balance and hardware,makes our hung window reliable and energy efficient.

VHD105-Double Hung Window - Aluminium Hung Windows

Thermal break American style aluminium double hung windows ,equipped with hybrid vacuum insulating glass,and world class Caldwell balance make it perfect.