A wide variety of deflection yoke corse are available for use in TV receivers and CRT displays.　The core materials range from the popular H44F to the HD grades for high-resolution displays.　These are produced in Japan, Taiwan, France and China for efficient supply.

These cores are produced from the 5H20 ferrites, which improve the current margin of flyback transformers, and from the 5H30 ferrites, which increase the frequency of high-resolutiondisplays.

These include 6H- and 7H-Series cores for switching power supplies and high-u cores for reducing electromagnetic interference. The 6H provides low-loss and DC overlapping advantages,while the 7H10 features low loss at 500KHz or higher frequencies.　Both help to downsize transformers.　The 2H provides five different grades according to permeability.

These cores are intended to suppress EMI (electromagnetic interference) that is increasingly generated as electronic equipment operates at ever hifher fequencies.　FDK provides K- and L-Series cores for the control of noise from 10-30MHz terminals and unnecessary radiation noise from 30-500MHz equipment.　They come in eight different shapes.

These cores are widely used the high-frequency coils of TV receicers, VCRs, radios, game machines and so on.　FDK offers over 30 material selections according to permeability (u), flux density (B), and molding characteristics.　The cores meet the cver-strict demand for higher precision and quality accompanyuing the downsizing trend.