Generic Household RFI Kits Mix 31 Store/Ferrite Core Products/Mix 31Ring - Mix 31 - RFI Range: 1-300 MHzRing - Mix 31 - RFI Range: 1-300 MHzSnap On - Mix 31 - RFI Range 1-300 MHzSnap On - Mix 31 - RFI Range 1-300 MHzSlip On - Mix 31 - RFI Range 1-300 MHzSlip On - Mix 31 - RFI Range 1-300 MHz