Herman Miller Setu Chair: Ribbon Arms - Hard Floor Casters - Graphite Frame/5 Star H-Alloy Base/Graphite Lyris The Kinematic Spine, designed to combine strength and a flexibility that bends and moves automatically with your every move Lyris 2 suspension material's double interlocking weave construction adds strength and durability for a firm sit and a distinctive sheen Working in concert with the spine, Lyris 2 distributes your weight evenly and conforms to your contours simply by your weight when you sit down Made with 42 percent recycled materials, Setu chairs are 93 percent recyclable 12-year Herman Miller warranty with Official Born-On-Date sticker