Computer/Digital RFI Solutions Ferrite filter products can help speed up digital devices by suppressing common mode current from RFI sources OR prevent digital devices from emitting RFI on its connecting cables and power supply lines. Mix 43 Store / Mix 43 Ring - Mix 43 RFI Range: 25-300 MHz Ring - Mix 43 RFI Range: 25-300 MHz Snap On - Mix 43 - RFI Range 25-300 MHz Snap On - Mix 43 - RFI Range 25-300 MHz Slip On - Mix 43 - RFI Range 20-300 MHz Slip On - Mix 43 - RFI Range 20-300 MHz