... 4.tilt mechanism 5.hot sell,office furniture Office chair,office furniture,manager chair,executive chair,hotel chair,home furniture, PU upholstery,powder ... seat height adjust,high quality, competitive price. Chair description:1.material: black PU upholstery,many colors ... GB/T19001---2000idt IS09001: 2000 quality system authentication. chair specification: Size of back: 52x68CMSize of seat: ...