About A Chair AAC14, by Hay, a chair is designed by Hee Welling from soft and rounded design. Injection moulded solid-coloured polypropylene shell. 4 star swivel base in cast aluminium with soft wheels for all floors. Black base and polished base all shells come with black wheels. White base all shells come with white wheels with grey rubber. Other shells come with black wheels.About A Chair is the result of close collaboration between the designer Hee Welling and HAY. The chairs, comfortable and ergonomic shapes, provide optimum comfort and can be adapted to any space.