High Grade Cork / BUNA-N (Nitrile) Gasket Material 6.5" X 44" x 1/8" THICK Cork/buna-n material is a composite material that's good for a variety of applications, including sealing, automotive, and fuel pump applications: Sealing: Cork/buna-n material is a versatile, compressible material that can be used in a wide range of sealing applications. It's often used in automotive and sealing applications, such as valve covers, oil pans, and transmission pans. Automotive: Cork/buna-n material is recommended for automotive applications, such as fuel pumps and meters. Fuel pumps: Cork/buna-n material is recommended for fuel pump applications. Meters: Cork/buna-n material is recommended for meter applications. Cork/buna-n material is made of a combination of cork and a synthetic elastomer binder Buna/Nitrile. The elastomer improves the material's chemical compatibility and sealing performance.