There are materials in the Contact RFI package from Beryllium Copper.A type of Gasket is provided by the contacter RFI.The RFI EMI comes from the well-known Electronit series.
8402010242 Features
Gasket Electronit series
8402010242 Applications
There are a lot of Laird Technologies EMI 8402010242 RFI and EMI Contacts applications.