... height adjust,back tilt 4.hot Office chair,office furniture,manager chair,executive chair,hotel chair,home furniture, PU upholstery,powder coated ... with wheels 4. foam: good quality foam5. wood: bent wooden frame inside6.mechanism: Y-19 mechanism, seat height adjust, ... GB/T19001---2000idt IS09001: 2000 quality system authentication. chair specification:Size of seat:50x49CMSize of back:50x70CMHigh of ...