Previously known as DXE-CSB-COMBO Packs DX Engineering RFI Suppression Snap-On Ferrite Beads, here are all three sizes of snap beads with their new part number, DXE-CSB31-COMBO. We've added the mix number to the pack so you can tell at a glance that these are the mix-31 snap beads. Included in the combo pack are four small 0.275 in. inside diameter (ID) beads, two medium 0.525 inch ID beads and two large 0.750 inch ID beads. They fit over many different sizes of cables and wires so you can have the right size bead for to the job. 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 Combo Pack 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 application Note: For additional product information, please read the files under the "Documentation" tab.