Cord Many types of o-cord: O type, E type, U type, V type etc. Can be made on your requirement,Any sizes on your requirement Welcome to www.jbdrubber.comPrime Feature >Several material can choose on your requirement: NBR, SR, CR, PTFE etc.>Many types of o-cord: O type, E type, U type, V type etc. Can be made on your requirement>Any sizes on your requirement>Any color on your requirement, black, ...