Features: *** Bionic Spine Protection Back Rest, with Waist Support *** Up and down adjustment（5cm), as well as tilting for head rest *** Elastic tilting for back(90°-135°） *** 3D armrest adjustment(backward and forward; up and down) *** Seat up and down adjustment（7cm) *** Seat front and back adjustment(available only for high configuration) *** S shape ergonomic back support *** 360° swivel *** 2.5mm thickened explosion-proof frame *** Breathable highly-elastic mesh cloth, fine and wear-resistant *** Wheel: 60mm black PU Differences between Standard, High and Lumbar Ajustable Models: 1. High model's seat can slide back and forth(standard cannot) 2. High model has four angles lockable tilting, standard has three 3. Lumbar adjustable model=Standard model with adjustable chair back BONUS: Five-year warranty Shipping: Please choose 'others(West Malaysia)' as the shipping option, we'll use mr speedy to deliver same day or next day for KL customers. For other cities we use Pgeon. For East Malaysia, shipping will take 30+ days(sea shipment).