The Fair-Rite 8978101021 is a high-quality Toroid Core, meticulously crafted from Material 78. Supreme Components International, an authorised distributor of Fair-Rite, provides this core for applications demanding superior performance. Its toroidal shape ensures excellent magnetic flux containment, minimizing electromagnetic interference. The core's dimensions are A = 10.2 mm, B = 6.35 mm, and H = 3.18 mm. This ferrite core is widely used in power inductors, transformers, and chokes. Material 78 offers a good balance of permeability and saturation flux density. Choose this core for reliable and efficient magnetic component design. Supreme Components International guarantees authenticity and quality.