chromed on the surface, pp/pu pad assembled together Specificationsoffice chair armrest : 1. aluminum alloy, 2.chromed on the surface, 3. pp/pu pad assembled together.office chair armrest :1. aluminum alloy ,2. chromed on the surface ,3. 0.83kg/pc , pp/pu pad assembled together4. the screw hole distance is 425mm, and the width of arm is 48mm, office chair armrest