Seat, F20 Series, Mechanical Suspension / Arm Rest / Head Rest / Gray ClothNotes: Mechanical SuspensionNotes 2: Suspension Stroke 4" / 100mmNotes 3: Slide Track Travel 6" / 150mmNotes 4: Weight Adjustment 110 - 330 lbs. / 50 - 150kgNotes 5: Mechanical Lumbar SupportNotes 6: Ergonomic DesignNotes 7: Multi Angle Adjustable Backrest, Adjustable Headrest & Adjustable Fold-Up ArmrestsNotes 8: Polyurethane Seat Cushion & Backrest Covered By Durable Black Vinyl