Large Amounts of acrylonitrile end in a rubber with improved oil resistance. Compounds with small acrylonitrile content have a much better lower temperature versatility and resilience. Obtainable Finishes: 'SS' has a easy end on each side, 'CC' contains a cloth-print finish on both sides and 'CS' includes a smooth end https://beediadiamond.com/catalog/rubber-points