Review on VSKEY Clip-on Noise Filter [10pcs 7.0mm]: High-Frequency Ferrite Core Choke Clips for Speakers, Video, Radio, Amplifier & Home Audio Devices – Noise Suppressor (0.27 inch Inner Diameter) by Gerardo Cibrian

All snap ferrites (with one exception) (have minimum data sheets. You must specify at least (1) the maximum current to 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 that's crap if they want to do it some good in filtering conducted EMI, as you can imagine they didn't do socket C for my application (filtering 180-200MHz in the cable that runs the cable from the solar panels to the inverter).