Diiz Office Chair with Folding Armrests, Mesh Desk Chair, Ergonomic Computer Chair, 360° Swivel Chair, Adjustable Lumbar Support, Space Saving, Black - Adjusting the Rocking Mechanism: To activate the rocking mechanism, first raise the backrest (90°). Then pull the lever on the side of the seat outward. You can now rock the chair back and forth. Return the chair to a 90° position and push the lever inward to lock the backrest and seat. Adjusting the Resistance: To adjust the rocking resistance, turn the round knob under the seat. Turn the knob clockwise to decrease the resistance; turn the lever counterclockwise to increase the resistance. Product details: Colour: Black Material: Plastic, foam, nylon, steel Dimensions: Overall dimensions: 66 x 60 x (99-107) cm (L x W x H) Seat height (from floor): 46-54 cm Seat surface dimensions: 53 x 53 cm Backrest height and width: 53 x 51 cm Armrest height (from seat): 22 cm Max. static load capacity: 120 kg Package contents: 1 x Mesh office chair, 1 x Allen key, 1 x accessories, 1 x user manual (DE, EN, IT, FR, ES). Diiz Notes: Do not expose the product to direct sunlight for extended periods. Keep the product away from sharp and pointed objects to avoid damaging the surface.