The 7878400721 is a high-quality Ferrite Toroid Core from Fair-Rite. Supreme Components International is an authorised distributor of Fair-Rite electronic components, ensuring you receive a genuine product. This core is designed for a wide range of applications, including inductors, transformers, and noise filters. Its compact dimensions (4.75mm OD, 2.36mm ID, 2.39mm H) make it suitable for space-constrained designs. The core is constructed from Material 78, known for its excellent performance characteristics. Choose this reliable ferrite core for your next project. Benefit from our extensive inventory and fast shipping options.