The Fair-Rite 4077375211 is a high-quality toroid core made from their popular 77 material. This ferrite core is designed for a wide range of applications, including inductors, transformers, and chokes. Its toroidal shape provides excellent magnetic properties and minimizes electromagnetic interference (EMI). The core's dimensions are A = 12.5 mm (outer diameter), B = 7.5 mm (inner diameter), and H = 5 mm (height). The 77 material offers a good balance of permeability and saturation flux density. As an authorized distributor of Fair-Rite components, Supreme Components International guarantees the authenticity and quality of this product. This toroid core is suitable for various applications, including power supplies, signal filtering, and impedance matching.