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Ferroxcube is a world-leading manufacturer of high performance ferrite materials and E18/4/10/R-3F3-A250-P is part of their range of E Cores. This E18 core is made from 3F3 ferrite, which is a medium frequency power material that is suitable (at frequencies of 0.2-0.5 MHz) for use in general purpose and power transformers. The E18/4/10/R-3F3-A250-P E core from Ferroxcube has an AL value of 250 with a tolerance of +/-5%.