... ergonomic chair backrest,height,tilt,lock, armrest adjustment, aluminum alloy back base. MOQ: 10pcs High Quality Ergonomic Office Mesh Chair : MI Item ... fabricresistant PU or high-quality first-layer cowhide leather,mesh fabric,nylon.Base PlateIt can be tilted at an ... Color Of Leather/ Cloth Cover Is Optional .2. Different Mesh Back Can Match With Any Backrest . More Styles: Ergonomic Office ...