Hot Sale Colored NBR Rubber O Ring SealsMaterialSilicone, NBR, HNBR, FKM(FPM or Viton), EPDM,CR, NR, ... ,Medical equipment industry, heavy machinery, excavators, etc.The size of rubber seal ring also Can be Customized, If you need customized size, please ... to contact XINGKETAI sales representative in the end.Application: The rubber seal ring can using on the machine parts , on the clock , and ...