Ferrite beads are dowel-like devices having a center hole and are made from ferromagnetic material. These beads act as Radio-frequency (RF) chokes, when placed on to current carrying conductors. They offer convenient, inexpensive, and yet effective means of RF shielding, parasitic suppression and RF decoupling. Our Standard Ferrite Bead Cores are available in the following dimensions; However Products are also made to order for custom applications.