Review on Clip-on Noise Filter, VSKEY [10pcs 9.0mm] High-Frequency Ferrite Core Choke Cable Clip for Subwoofer, Speaker, Mixer, Home Audio Device - Effective Noise Suppressor (0.35 inch Inner Diameter) by Jon Manning

All snap ferrites (except one) (have minimal technical details. At MINIMUM they should specify (1) the maximum current saturation (where the EMI filtering goes away) and (2) either the effective frequency range or the material (from which you can look at the frequency range) Yes, they're cheap compared to other sources, but it's hell if they'll do all that well is to filter out conducted EMI. As you can imagine, for my application (filtering 180-200MHz in the cable that runs the cable from the solar panels to the inverter) they didn't make a socket S.