Reed gaskets for Banshee (4 needed normally, 6 needed with Reed Spacers), Yamaha YFZ350 Banshee 87-06 

These are not the cheap paper gaskets, these are AFM material with aluminum sandwiched in the middle.

A chemically blown, compounded nitrile synthetic rubber bonded to an aluminum core with a temperature resistance of over 205* F. AFM material has an 85% recovery while maintaining strong torque retention.