... or Made in Germany(ROTO Brand) Benefits:1.durable, will not rust, rot, warp, or need constant finish maintenance. The aluminum frame ... ,can fulfill the order on time,even in advance. 5.As a facotry,we have a strong technical team,can offer CAD technical ... a factory,we can keep you regularly informed of order progress and problems. Feel free to contact me for more details thermal break sliding aluminum ...