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is the first bit from googleWhat are toroids? Sometimes these are incorrectly spelt torroids. These come in two types, powdered iron toroids or ferrite toroids. Both introduce permeability. Toroids look exactly like doughnuts and come in various diameters, thicknesses, permeabilities and types depending upon the frequency range of interest. Includes links to Micrometals inductor design software and Micrometals RF design software."