KB-8907A EXECUTIVE MESH CHAIR , 1) With moulded foam, Aluminium base with PU pad, omnidirectional adjustable 2) multi-funcational, Locking lever offers 3 locking position with a "return prevention"safety function. 3) 350MMNEW DESIGN NYLONBASE, LANT 4 GRADEGAS LIFT, hubcap style castors. This substantial nice chair is designed based on German mechanical elements.