Feature●Nickel-Zinc Ferrite Toroidal Core●ID: 0.61" x OD: 1" x HT: 0.25"●Type 43 Material●Wldely used for medium frequency inductors and wideband transformers up to 50 MHz. Very good frequency attenuation frorn 30 MHz to 400 MHz●Suited for low power, high inductance resonant clrcuits and wideband applications.Description Nickel Zinc Ferrite Toroidal Core ID: 0.61 x OD: 1.0 x HT: 0.21"