Common Mode Noise Filter – Coax +3 F23-61 Ferrite Ring - .12" ID, .229" OD - RFI Range - 200-2000 MHz F23-61 $0.39 In stock Quantity: 1 Add to Bag Product Details MPN: F23-61 Initial Permeability (@ 10KHz): 125 Material: MnZn OD (A) - in/mm: .229/5.95 ID (B) - in/mm: .12/3.05 Length (C) - in/mm: .06/1.65 Ferrite Ring, ID = .12 in/3.05mm, Mix 61 Save this product for later Favorite Typical user comment: The filter was quite effective. Was surprised that it actually reduced the noise level more than the signal so S+N/N improved by 1.9 S units. Bill