Nitrile (beater-add, NV-512); 3-Year Full Warranty.  Brand New gasket with guaranteed fit and function. All Materials and Manufacturing Sourced and MADE IN USA.  Listing picture depicts Nitrile Gasket material. This gasket material is treated chemically to seal against oils, water, alcohol, grease, air, gasoline and solvents. If you need any assistance, feel free to ask. Fits: Z50RA (79) MOTORCYCLE, JPN, VIN# AB02-5000009 TO AB02-5024801 Z50RA (80) MOTORCYCLE, JPN, VIN# AB02-5100007 TO AB02-5110396 Z50RA (81) MOTORCYCLE, JPN, VIN# JH2AB020-BS200002 TO JH2AB020-BS211751