The Fair-Rite 5943001821 is a high-quality Ferrite Toroid Core, available at Supreme Components International, an authorised distributor of Fair-Rite components. This core is made from Material 43, known for its excellent performance in a wide range of frequencies. Its toroidal shape ensures efficient magnetic flux containment, minimizing electromagnetic interference (EMI). The core's dimensions are 9.4mm outer diameter (OD), 4.7mm inner diameter (ID), and 3.1mm height (H). This makes it suitable for applications such as inductors, transformers, and chokes. Choose this reliable and compact toroid core for your next electronic project. Supreme Components International guarantees authenticity and quality.