Review on Topnisus [Pack of 10] Clip-on Ferrite Core Ring Bead Cable Clip - Anti-Interference Filter for RFI EMI Noise Suppression, High-Frequency Optimization (5mm Inner Diameter) by Vincent Burton

It didn't work for my application but I still give 4 stars - they are well made. The description and picture are a bit misleading, "(diameter 3mm/5mm/7mm/9mm/13mm)" and the picture gives the impression that you will receive a set of different sizes. I noticed this discrepancy and asked and the seller answered accurately (I ended up buying them anyway, mostly by mistake; will use them for other purposes). It's actually 10 identical (small!) parts with an internal diameter of 3mm - suitable for something like headphones or a USB cable, maybe small DC cables; but not anymore.