Walter Knoll FK is a bucket design chair. FK is simply an icon of its design. This version expressive interpretation on a hard shine separates the inner shell of the bucket with soft material upholstery. FK has breathtakingly sweeping lines and contains generous space for an extra comfort sit. Choosing Refurbished Chairs: We love bringing these back to life with it being fully steam cleaned. Parts remain: The chair will remain with its original material and framework. The chair may show signs of minor scuffs and wear. This will not affect the functionality of the chair.