FAB INTERNATIONAL 10 Pack Silicone Sealing Rings Compatible Gasket for Mason Jars (After Market Item) Wide Mouth. Made from food grade Silicone Rubber ID: 70mm/2.8in (appx.) OD: 86mm/3.4in (appx.) Thickness: 1.6 You can also use the grid on the images to estimate the size of the gasket. May not fit all models. Wash all gaskets with soap and water before using. This is an after market item and not an Original Equipment Manufactured item the all brand names and trademarks used for reference purpose only, this product is not endorsed or sponsored by Mason or any other Original Equipment Manufacturer, nor there is any intent to imply that this is an original equipment part.