The Fair-Rite 5943006421 is a high-quality Toroid Core, meticulously crafted from Material 43. Supreme Components International is an authorised distributor of Fair-Rite components, ensuring you receive genuine products. This core is specifically designed for applications requiring efficient magnetic flux paths, such as inductors, transformers, and chokes. Its toroidal shape minimizes electromagnetic interference (EMI) and provides excellent self-shielding properties. The core's dimensions (9.4mm OD, 4.7mm ID, 3.2mm H) and inductance factor (A_L = 14.5 nH/N²) allow for precise inductance control. Material 43 offers a good balance of permeability and core loss, making it suitable for a wide range of frequencies. This core is ideal for applications in power supplies, signal processing circuits, and EMI/RFI filters. Trust Supreme Components International for your ferrite core needs.