The 5977001001 is a high-quality Toroid Core manufactured by Fair-Rite, a leading name in ferrite technology. This core is made from Fair-Rite's popular 77 material, known for its excellent performance characteristics in a wide range of frequencies. Toroid cores are commonly used in inductors, transformers, and chokes due to their efficient magnetic flux containment, minimizing electromagnetic interference (EMI). Supreme Components International is an authorised distributor of Fair-Rite components, ensuring you receive a genuine product with full manufacturer support. This core is perfect for applications requiring high inductance, low core loss, and compact size. Trust Supreme Components International for all your electronic component needs.