The Contact RFI is packaged with the materials of Beryllium Copper.Type Fingerstock from the contacter RFI.As you may know, this RFI EMI comes from the well-known NIC 3.0 series product line.
LT18CJ1923 Features
Fingerstock NIC 3.0 series
LT18CJ1923 Applications
There are a lot of Laird Technologies EMI LT18CJ1923 RFI and EMI Contacts applications.