4 Harry Bertoia Knoll Barstools 4 Harry Bertoia for Knoll barstools. These examples have black iron frames with black vinyl cushions. They can be sold as pairs or as a set of four. Price listed is for the set of four. Post navigationPrevious post: Cocoa Leather & Rosewood Eames 670 Chair & OttomanNext post: Erik Jorgensen Leather ‘Pelican’ Sofa