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Chinese High Quality NBR Nitrile Buna-N Rubber O Ring Rubber Seal. Customization Options: Customized size, material, shape, hardness, and color available. Wide Material Selection: Available in NBR, Silicone, HNBR, FKM, EPDM, PU, and PTFE. Free Samples: 3-10 free samples available, customer pays only shipping cost. Fast Delivery: Standard delivery time is 7-15 days from Shanghai port. OEM/ODM Service: Full customization support based on customer samples or 3D drawings. High Quality Assurance: Pre-production samples and 100% final inspection before shipment. Versatile Applications: Suitable for oil & gas, automotive, aerospace, and food industries. ISO9001 Certified: Comprehensive quality management system ensures product reliability.