22PC Set 3.5mm, 5mm, 7mm, 9mm Ferrite Snap on Ring Cable Clip Core Noise Suppressor Interference Filter A3971
BLACK PLASTIC ENCLOSED FERRITE CORE FOR 1/2 inch POWER CORD
Gray Ferrite Filter Core, 10MM (O.375 inch) I.D. noise suppression snap on bead. 35mm long x 20mm diameter.
Ferrite Cores are used for suppressing and dissipating high-frequency electrical noises. These filters are effective at attenuating EMI in electromagnetic circuits and devices. Ferrite beads, ferrite cores, and ferrite core inductors.