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KnollStudio Bertoia Molded Shell Stool

$880.00 $609.00 (You save $271.00)
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Ships in 5-7 business days

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The Bertoia Molded Shell Stool is an iconic design with a playful tone based on the original 1960's wire-form infamous Bertoia. This new stool has the natural flex of the original with a pop shell and comes in counter or bar height. This customized Knoll chair can be shipped in 5-7 business days. Shipping as always is Free*If shipping to a residential address surcharges may apply.

Construction and Features
  • Counter or bar height
  • Seat is glass fiber reinforced nylon
  • Base is constructed of welded steel rods with polished chrome finish 
  • Plastic glides included on sled base to protect floors
  • Knoll logo stamped into the back of the base
  • GREENGUARD Indoor Air Quality Certified®
  • *If shipping to a residential address surcharges may apply.
  • 12 Year Warranty


  • 427N Counter Height 21.75"W x  22"D x 39.5"H; Seat Height 27.5"
  • 428N Bar Height 21.75"W x 22"D x 41.25"H; Seat Height 29.25"




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We are an authorized Knoll retailer. Please contact us directly for information or pricing on this Knoll chair or any other Knoll product.











Warranty Knoll warrants to You only that the Products Knoll manufactures and sells to You are free of defects in workmanship and materials. Should any failure to conform to this limited warranty appear to a Product listed below during the applicable warranty period from the date of shipment, Knoll shall, upon prompt written notice, repair or replace, at its option and cost, the affected part or parts. Furniture and Accessories
Lifetime Antenna® Workspaces, Calibre®
12 Years Chadwick®, Essentials Work Chairs, Generation by Knoll® , ReGeneration by Knoll®, Life®, Moment®, MultiGeneration by Knoll®, RPM® and Sapper seating (except seating upholstery, textiles, leathers and finishes, see below).
10 Years Antenna Workspaces, AutoStrada, Crinion Open Table, Reff Profiles wood components, Series 2 Veneer Front Storage, cascade edge worksurfaces, Wood Casegoods (Magnusson, The Graham Collection, except wood casegoods upholstered surfaces, see below), Interaction tables (except height adjustment mechanisms for Counterforce, crank-adjustable, and split-top tables and worksurfaces, see below), Reuter overheads, Reuter vertical storage, KnollExtra Sapper Monitor Arm Collection and XYZ monitor arm, Adjustable keyboard mechanisms and platforms, Communication Boards (except fabric board textiles, see below), Smokador® collection (except leathers, see below), Orchestra® Universal Systems Accessories, and k. lounge structural components.
5 Years KnollStudio, Operational parts, controls, electrical, Lighting (except light ballasts, bulbs and power supply, see below), special or custom product, wood veneer products, Currents handcrank, Interaction Counterforce, Interaction crank-adjustable, and split-top mechanisms, CPU storage and all universal storage drawers.
3 Years Seating upholstery, textiles, leathers and finishes. Fabric boards textiles and Smokador Collection leathers.
2 Years All other KnollExtra products.
1 Year Light ballasts, bulbs and power supply, seating upholstered armpads and soft armpads,wood casegoods upholstered surfaces, k. lounge upholstery and k. lounge fabric. This warranty does not apply to:
Normal wear and tear or acts or omissions of parties other than Seller (including user modification, improper use or installation of Products). COM or other third party materials applied to Products. Dramatic temperature variations or exposure to unusual conditions. Changes in surface finishes, including colorfastness due to aging or exposure to light. Except as specifically noted above, textiles and upholstery supplied by KnollTextiles (which are subject to the warranty listed below). Natural variations occurring in wood, marble, and leather shall not be considered defects, and the Seller does not guarantee the colorfastness or matching of the colors, grains or textures, or surface hardness of such materials. The Seller also does not guarantee the colorfastness of fiberglass panel surfaces.