Livin office chair executive chair swivel chair computer chair seat height adjustment office chair upholstery , Please note: - When mounting the support part, make sure that the side marked "Front" faces forward. -Pulling the lever outwards activates the rocking function. The backrest is not fixed and supports the back with every movement and moves dynamically. Pushing the lever back in deactivates the rocking function. The backrest can be locked again. -When the rocking function is activated, the seat and backrest move together when you lean back. The angle of the backrest cannot be adjusted separately from the seat. Product details: - Color: Black - Material: Artificial leather, sponge, chrome-plated metal - The gas spring is tested by SGS according to BIFMA X 5.1 and by TÜV Rheinland according to DIN 4550, class 3. -The certificate holder is the supplier.Scope of delivery: - 1 x office chair - 1 x user manual (German, English, French, Italian, Spanish) - 1 x bag with mounting material,