The Fair-Rite 2643023201 is a high-quality Ferrite Toroid Core, available through Supreme Components International, an authorised distributor. This core is constructed from Material 43, known for its excellent performance characteristics in a wide range of frequencies. The core's dimensions are A = 12.7 mm, B = 7.4 mm, and C = 4.8 mm, making it suitable for applications requiring a compact and efficient magnetic component. Toroid cores offer superior performance compared to other core shapes due to their closed-loop design, which minimizes flux leakage and maximizes inductance. This Fair-Rite toroid core is ideal for use in inductors, transformers, and other magnetic components where high efficiency and low EMI are critical. Supreme Components International guarantees the authenticity and quality of this Fair-Rite product.