O ring cord is supplied as a continuous extruded cord and can be used to make Vulcanised Cord Rings when standard size O-rings are not suitable. O ring cord is a major stock line for EAP Seals, we hold large stocks of; Nitrile FKM FDA Approved Silicone EPDM Neoprene from 1.60mm – 40.00mm in standard shore hardness’s with larger diameters available on request. Additional Materials (including HNBR and DuPont Viton® Cord) and shore hardness’s are also available on request.