Previously known as DXE-CSB-525P DX Engineering RFI Suppression Snap-On Ferrite Beads, here are the medium snap beads with their new part number, DXE-CSB31-525-5. We've added the mix and quantity numbers to the size number so you can tell at a glance that these are the mix-31 snap beads, middle sized in a 5-pack. With an inside diameter (ID) of 0.525 in. (just over one-half of an inch) they close and fit over cable sizes such as RG-8, RG-213, LMR-400 and DXE-400MAX as well as many power supply, mobile computer, ignition and injector system cables and control wires.RFI Suppression Snap-On Ferrite Beads act as an RF choke when placed around a current-carrying conductor. They offer a convenient, inexpensive and effective means of RF shielding, parasitic suppression, and RF decoupling. With a sufficient number of these Snap-On Beads, pulse noise and RFI may be virtually eliminated from your radio or other electronic device.Their special ferrite mix is ideal at HF and VHF and effectively decouples or chokes unwanted RF and RF noise on automobile ignition systems, speaker wires, control cables, or other wires and cables suspected to be absorbing or radiating RF interference. DX Engineering RFI Suppression Beads simply snap on, so no cutting is needed to install. Winding smaller wires around snap-bead cores before closing them provides a greater degree of RF choking and noise suppression.DX Engineering Ferrite Medium RFI Suppression Snap-On Ferrite Beads features include:* Reduced or eliminated ignition/injector noise in mobile applications* 3 S-units improvement not uncommon* Hear many more stations* 31-mix is optimal for HF and VHF* Mobile, home, or shack use--any RFI applicationNote: For additional product information, please read the files under the "Documentation" tab.