The FAIR-RITE 5975005101 is a toroid core made of NiZn material, specifically the 75 material formulation. This core is commonly used in the construction of inductors, transformers, and other magnetic components. Its toroidal shape provides a closed magnetic path, minimizing flux leakage and improving efficiency. The core's dimensions are A = 12.7 mm (outer diameter), B = 7.3 mm (inner diameter), and H = 4.8 mm (height). Supreme Components International is an authorised distributor of FAIR-RITE, ensuring you receive a genuine, high-quality component. This core is suitable for a wide range of applications, including power supplies, filters, and signal processing circuits. The 75 material offers a good balance of permeability and frequency performance.