Rubber Seal Colored Silicone Rubber O Rings Sealing Rings. Customized Material Options: Available in NBR, CR, SBR, EPDM, IIR, HNBR, ACM, NR, EP, SIL, FKM and more. Customized Color and Design: Colors include transparent, black, and any other custom requirements based on drawings. Customized Hardness: Hardness ranges from 30 to 90 Shore A to meet specific application needs. Free Design and Samples: Design services are free; samples are provided free of charge (buyer pays mold/post). OEM and ODM Services: Highly welcomed with over 10 years of experience in molded rubber parts. ISO Certified Quality: Certified with ISO9001:2008, RoHS, and FDA with a strict quality control system. Fast Delivery Time: Sample delivery takes 3-7 days; mass production takes 7-45 days depending on quantity. Wide Application Range: Suitable for Automotive, Industrial, Medical, Agricultural, and Solar energy sectors.