1)Polished high-quality, high-quality surface treatment.2)High quality hard wood frame.3)The unique making technology of interior structure to ensure chair's reliability.4)The precision design of perforation.Durability ensured with steel flat socket cap screw and lockout.5)V-shape Metal cocked hat(angle iron) support the bottom of chair making it very stable and strong.6)The Distinctive Design of Wood Structures with Mortise and Tenon Connection.