PD-TRI The  triangle system is made of AL6005-T5. The overall structure has three angles of aluminum connected to each other to form a triangular structure. Product Details Name: Adjustable Traingle Solar Mounting System Brand: PandaSolar Item: PD-TRI Product Origin: Fujian, China Material:  SUS304+AL-6005-T5, Surface Treatment: Anodized Warranty: 12years Duration:  25years Shipping Port: XiaMen Port