The 77 Material RF Antenna Ferrite Rod by Amidon is a high-quality electronic component with a diameter of 0.5 inches and a length of 7.5 inches, the rod is clean broken in one place giving a 2-3/4" and a 4-3/4" rod. It is designed for use in antennas and offers excellent RF properties. This ferrite rod is ideal for various electronic applications, providing reliable performance and efficiency.