As bar stool swivel manufacturers, Faull and Sons have engineered the simple design of the Swiv-lon furniture swivels by eliminating the balls and replacing them with a highly durable nylon bearing. The goal of Faull and Sons is to produce the highest quality, longest lasting swivels on the market. They strive to test their products with rigorous use in mind. Therefore, their products are "Torture-tested." Loaded with 500 lbs and rotated over 500,000 revolutions.