... ,back tilt 4.hot sell Office chair,office furniture,manager chair,executive chair,hotel chair,home furniture, PU upholstery,powder coated ... freely with wheels 4. foam: good quality foam5. wood: bentwood inside6.mechanism: Y-19 mechanism, seat height adjust, back ... passed GB/T19001---2000idt IS09001: 2000 quality system authentication. chair specification:Size of back: 52x77CMSize of seat: 51x52CMHigh of ...