The Fair-Rite 4077312911 is a high-quality Toroid Core, manufactured using the popular 77 material. Supreme Components International, an authorised distributor of Fair-Rite components, ensures you receive a genuine product. This core is specifically designed for applications requiring efficient magnetic flux paths, such as inductors, transformers, and chokes. Its toroidal shape minimizes electromagnetic interference (EMI) and provides excellent inductance characteristics. The core's dimensions are A = 12.7 mm (outer diameter), B = 7.4 mm (inner diameter), and H = 4.8 mm (height). The 77 material offers a good balance of permeability and core loss, making it suitable for a wide range of frequencies. Choose Fair-Rite for reliable performance and consistent results in your magnetic component designs. Supreme Components International is your trusted source for authentic electronic components.