NBR FKM HNBR Silicone EPDM Quad Ring Star Ring and X-Rings. Multi-Lobed Sealing Design: X-Ring profile provides twice sealing surface, reducing friction and wear for prolonged seal life. Wide Material Selection: Available in NBR, FKM, HNBR, EPDM, Silicone, CR, PTFE, and more for diverse industrial needs. Spiral Failure Prevention: Stable 'X' profile resists rolling in grooves, ideal for dynamic applications compared to O-Rings. Custom OEM/ODM Service: Welcome to customize size, shape, and material according to drawings, samples, or descriptions. Certified Quality Materials: Materials certified by SGS, FDA, CE, RoHS, REACH, and TS16949 for safety and compliance. Versatile Application Scope: Used in machinery, automotive, oilfield, electronics, chemicals, and household appliances.