2643000401 is a ferrite core manufactured by Fair-Rite. This core is made of Sendust material, with a high permeability value, and a high saturation flux density. It is ideal for broadband, high frequency applications such as RF filters, pulse transformers, and power line chokes. This core is non-magnetisable, meaning that it does not require a magnetic shield. This core is available in sizes from 28 to 141, allowing for flexibility in design and enabling users to find the best fit for their application.