The 5943003801 is a high-quality Toroid Core from FAIR-RITE, a leading manufacturer of ferrite components. Supreme Components International is an authorised distributor of FAIR-RITE, ensuring you receive genuine parts. This ferrite core, made from #43 material, is specifically designed for use in inductors, transformers, and other magnetic components. Its toroidal shape provides a closed magnetic path, minimizing flux leakage and maximizing inductance. The #43 material offers a good balance of permeability and core loss, making it suitable for a wide range of frequencies. This core is ideal for applications requiring high efficiency and low electromagnetic interference (EMI). Trust Supreme Components International for all your FAIR-RITE component needs.