HIGHBACK: 580W X 600D X 1140-1240H MEDIUMBACK: 580W X 600D X 1040-1140H MM LOWBACK: 580W X 600D X 940-1040H MM VISITOR: 580W X 600D X 960H MM POLYPROPYLENE ROLLER CHAIR BASE SYNCHRONISED MECHANISM WITH 1 LOCKING POSITION SURFACE: FABRIC ONLY