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OFFERTABertoia 421 is an armchair designed by Harry Bertoia for Knoll. The seat and base are constructed of welded steel rods with polished chrome, nickel or black or white Rilsan® finish. The cushion attaches directly to the frame with hidden monofilament and metal hooks. The chrome or nickel finish is not suitable for outdoor use. Plastic skids included on the sled base to protect floors.