About A Chair AAC 10 swivel chair by Hee Welling

HAY describes the AAC 10 as adopting "a more formal expression than its wooden-legged counterparts," while retaining "the same open, curved shell, and legs that splay out from a centered base." It is the narrowest of the swivel models at 51 cm, and it does not have armrests.

The shell: recycled polypropylene, what HAY calls "2.0"

The seat and backrest form a single injection-molded shell made from post-consumer plastic waste: this is what the "2.0" in the color names refers to. The material is mass-dyed: a scratch will not reveal a different color underneath, and maintenance is limited to soapy water. On lighter shades, slight variations in hue are inherent to recycled material.

The swivel base: cast aluminum, polished or powder-coated

The base is a piece of cast aluminum—HAY writes cast aluminum swivel base—with four legs splaying out from a single center point. The shell swivels on this base. The gliders are standard gliders, not casters: the chair rotates on its own axis but does not move on its own, which makes it more suitable for a meeting or dining table than a workstation.

Two finishes. The polished aluminum is bare, shiny metal, whose luster comes from mechanical polishing: it can show fingerprints and can be brightened with a soft cloth. The black powder-coated aluminum is finished with a baked-on powder: a thick, matte layer that is more resistant to impact. HAY presents this base as "a more formal expression" than that of the wooden-legged models.