The FAIR-RITE 5977004921 is a high-quality Toroid Core designed for optimal performance in various electronic applications. Manufactured from #77 material, this uncoated core offers excellent magnetic properties. Supreme Components International is an authorised distributor of FAIR-RITE components, ensuring you receive a genuine product. This toroid core is commonly used in inductors, transformers, and chokes, providing efficient magnetic flux containment and minimizing electromagnetic interference. Its toroidal shape allows for self-shielding, reducing external magnetic fields. The #77 material offers a good balance of permeability and core loss, making it suitable for a wide range of frequencies. Trust Supreme Components International for all your FAIR-RITE component needs.