Qty 4- Brand new production (not surplus!!!) silicone made in USA arctic rated wheel o-rings commonly used on U.S. military two piece combat style wheels. Wheel o-ring is 3/8” and rated for -60 to 350F for extreme applications. Silicone o-rings have a 20 Year shelf life. Questions ? 5076762972 Jim we are glad to help you with all your 6x6 truck part needs. On the web at Army 6x6 LLC.