We have 13 years of experience in the production of doors and windows, about 60-100pcs worker , have R&D and QC teams,10 pcs production line ,We have many product patents for our doors and windows, and we have mastered core technologies, such as using wood grain color for aluminum alloy doors and will not change color 15years,If you are a real estate or construction company, and you purchase my products, your house, and the doors and windows of the client's house, I guarantee that you will purchase my aluminum alloy wood grain color doors and windows, which will not change color for at least 15 years and up to 25 years. Looking forward to cooperate with you,help your business bigger and bigger , Longtai will be your strong suppiler .