... nylon base,Y-19 mechanism, back tilt, seat height adjust,high quality, competitive price. Chair description:1.material: PU upholstery, ... armrest: soft pad and powder coated armrest3. base: powder coated five star base, PU castor, move freely with wheels 4. foam ... be sewed on each chair.2. Elegant design, excellent workmanship3. high quality , competitive price, durable. Quality control:1.Have strict ...