The Fair-Rite 4277353509 is a high-quality 77 material toroid core, available from Supreme Components International, an authorised distributor. This core is characterized by its 11.2nH/N^2 inductance factor (A), making it suitable for a wide range of applications. Its dimensions include a 35.3mm outer diameter, a 22.9mm inner diameter, and a 14.6mm height. The 77 material offers a good balance of permeability and core loss, making it a versatile choice for inductor and transformer designs. Trust Supreme Components International for reliable electronic components.