Castelle Patio Furniture: Castelle is manufacturered in a 300,000 square foot state of the art facility in Costa Rica. It is constructed of rust free, lightweight, durable aircraft grade, quality aluminum. Castelle maintains proprietary extrusion design, incorporating interior internal wall structure for additional support. These extrusions are 30% thicker in wall dimension than most comparable furniture. All welded points and connections are done with full circumference welding, meaning 360 degrees, eliminating gaps and stress points. By this fashion of welding, moisture is prevented from entering the frame structure. All welded areas are then hand ground, buffed and polished giving this product its seamless handcrafted appearance.