Different dimensions of toroidal cores made of iron powder, sendust, MPP, high fluxIron powder toroidal cores used in:Output chokes for switching power supplies Constructed EMI nose filters Pulse transformers, DC output, input filters Light dimmer chokes (PFc) Power factor correction inductors Continuous mode fly-back inductorsSendust toroidal cores used in switching regulator inductors, in-line noise filters,pulse transformers, fly-back transformers MPP toroidal cores used inHigh Q inductors, low loss filter circuits, loading coils, transformers, chokes andinductors Output filters, storage chokesHigh flux toroidal cores used in in-line noise filters, switching regulator inductors,pulse transformers, fly-back transformers High flux toroidal cores used in PFC chokes, output filters, storage chokes producing area:China