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 Ultraflex series product line.
8101010140 Features
Gasket Ultraflex series
8101010140 Applications
There are a lot of Laird Technologies EMI 8101010140 RFI and EMI Contacts applications.