Honestly I do not know how may be more than one star this chair. If I had the Chinese Graukarton see where he comes and makes you this on one sees chaos. The plastic parts due to poor packaging all broken. The hole size on the back of the seat agree not bzw.sind totally wrong then the chair will be not adjusted in height because apparently the gas spring is not working. This is by far the bekackteste chair I've ever had. Stay away from the China crap !!! That `s not worth it. Invested prefer a bissel more and you have more of it. Overall, it should be allowed to sell an insolence something through Amazon!