Inspired by Harry Bertoia's sculptural metal grid, X3 combines form and innovation. X3 is a one-piece shell, obtained by the bi-injection of transparent polycarbonate and a desmopan colored lattice. The complex molding technology, applied for the first time to furniture, brings a unique, versatile effect to the chair. Chrome plated steel base. Stacks 15 on the floor. Also available in bar and counter height stool. Overall Dimensions: W 21", H 30 1/4", D 18 1/2", Seat Height 17 1/4". See Knoll website for seating options. GREENGUARD Certification