Back & seat cover: Premium deformation resistant high-density hard plywood, high-standard surface treatment processes. Leg: Made from top quality steel after precise pressing and welding, and gone through procedures of polishing anti-rusting, phosphing, spraying and powder coating. Armrest cover: Imported timber externally applied with polyester coating Fabric: Stain and discoloration resistant premium fabric. Cushion: Gravity returning mechanism. Writing pad: High-strength fiber plastic writing pad die-casted with high-strength aluminum alloy rotating mechanism. Certificate: ISO9001 and ISO14001 Quality Guarantee: 5 Years Small Order and Mixed Order: Acceptable