There is a Contact RFI that contains materials from Beryllium Copper.A contacter RFI with the Gasket type.The RFI EMI that you are looking at comes from our well-known Electroground Washers series product line.
8907011640 Features
Gasket Electroground Washers series
8907011640 Applications
There are a lot of Laird Technologies EMI 8907011640 RFI and EMI Contacts applications.