Another name for X Rings can be Quad-Rings or Nu-Lips, and they are used in many variations for strong static or dynamic sealing applications. X Rings differ from O Rings where they have 2 sealing areas per side whereas O Rings just have one. This is down to the unique 4-lobe configuration, and therefore they require less compression to maintain a solid seal. It also stops the seal twisting in its groove, so reduces friction and increases the life of seal. X Rings are also referred as standard size O Rings, having the same dimensions as the AS568A O Rings, and are available in various materials. Contact us today, we can supply such a wide range of these products with same day shipping.