70pcs inner diameter 13mm split empressor ferrite core UF1330BG for diamter of 13 14mm cables

Although these ferrite cores are usable, I found that I needed to piggy-back 3 or 4 in order to get a noticeable effect.Without knowing the 'mix' its hard to determine the quality or even the frequency these will work best on. For future reference, the seller should provide a bit more technically accurate information.