ticova ergonomic office chair - high back desk chair with adjustable lumbar support, headrest & 3d metal armrest - 130° rocking mesh computer chair ticova why choosing ticova?<br> ticova's professional design team has done their best to improve every parts of this ergonomic office chair by dozens of testing, so that we can offer you a real ergonomic chair.<br> ticova is a professional and fast developing company specializing on office chair. due to the specialization, we can pay more effort on the design improvement and quality control of our office chair compared with others. ticova’s ambition is to provide nicely designed and comfortable adjustable office chair with high quality and competitive price to our consumers.<br></br> kindly notes:<br> if you find it difficult to press the wheels fully into ergonomic office chair legs due to the ring on wheels, which can greatly reduce the vibration and noise of wheels, please use one palm to press the chair leg on the floor, while using another palm to press the wheel greatly into the chair leg.<br></br> usage advice:<br> 1. make sure the ergonomic mesh chair is firm enough before usage. if the mesh chair is <b>shaky, uneven, tilted or with noise,</b> please screw up further, especially for the leg screws.<br> 2. please <b>sit deeper</b> to experience more supportive backrest, seat cushion and headrest.<br> 3. please choose an open area for assembly. you may put the carton on the floor to prevent abrasion between the floor and the ergonomic mesh chair.<br> 4. avoid long time direct sunshine on the mesh office chair. keep it away from fire and wet area.<br> 5. do not use chemical detergent to clean the high back office chair.<br> 6. to unlock the tilting function, please pull the handle out and lean back slightly until a 'click' sound.<br></br> safety guarantee:<br> our mechanism, chair base, wheels and gas lift have passed bifma test; therefore, you do not need to worry about the breakage and other safety issue. we promise you a safe and comfortable lumbar support chair.