Seat, F20 Series, Slide Track / Arm Rest / Head Rest / Gray ClothNotes: Slide Track Fore & Aft Travel Is 6" / 150mmNotes 2: Slide Tracks Are Mounted To Slotted Adjustable Brackets. Width Adjusts From 6" / 150mm ToNotes 3: Mechanical Lumbar SupportNotes 4: Ergonomic DesignNotes 5: Multi Angle Adjustable Backrest, Adjustable Headrest & Adjustable Fold-Up ArmrestsNotes 6: Polyurethane Seat Cushion & Backrest Covered By Durable Black VinylNotes 7: Seat Cushion & Backrest Are RemoveableNotes 8: Heavy Duty Construction, Some Assembly Required