The Fair-Rite 6278180121 is a Toroid Core crafted from Material 78, making it suitable for a wide range of applications requiring efficient magnetic cores. Supreme Components International is an authorised distributor of Fair-Rite, ensuring you receive authentic components. This core's dimensions are A = 12.1 mm, B = 7.4 mm, and H = 4.6 mm. Toroid cores are known for their closed magnetic path, which minimizes flux leakage and enhances inductance. This particular core is commonly used in power inductors, transformers, and filters. Its compact size and superior magnetic properties make it a reliable choice for demanding electronic designs. Choose Fair-Rite for quality and performance.