X-Ring: 1. X-Rings, also known as Quad-Rings®, can be used in a wide variety of static and dynamic sealing applications. 2. X-rings have 2 sealing areas per side, more effective sealing, reducing friction and increasing seal life. 3. X-rings have the same dimensions as the AS568A O-ring sizes, also referred to as standard size O-rings. 4. They are available from various compounds to suit your particular application.