The Fair-Rite 7878400421 is a high-quality Toroid Core, ideal for applications such as inductors, transformers, and chokes. This ferrite core, made of Material 78, offers excellent performance characteristics. Its toroidal shape provides a closed magnetic path, minimizing flux leakage and maximizing inductance. With dimensions of 40.64mm OD x 24.13mm ID x 11.13mm H, this core is suitable for a wide range of electronic designs. As an authorized distributor of Fair-Rite components, Supreme Components International guarantees the authenticity and quality of this product. Choose this toroid core for reliable and efficient performance in your next project.