the product name is Alloy Powder Core

Shaanxi Gold-Stone Electronics Co.,Ltd is one of the leading alloy powder core manufacturers and suppliers,Website:http://www.gsmagnetics.com, welcome to buy high quality alloy powder core, toroidal alloy powder core, mpp cores, high flux cores, sendust core products from our factory.Different dimensions of toroidal      cores made of iron powder,sendust, MPP, high fluxIron powder toroidal cores used      in:Output chokes for switching power       suppliesConstructed EMI nose filtersPulse transformers, DC output,       input filtersLight dimmer chokes (PFc)Power factor correction inductorsContinuous mode fly-back       inductorsAlloy Power Core Catalog         Material Characteristics CuresTemperture StabilityTypical Incremental Permeability vs. D.C. BiasPermeability vs. AC Flux DensityPermeability vs. FrequencyCore Loss vs. Flux DensityToroidal coresMPP, HF, KS 031-14 to 040-125 SeriesMPP, HF, KS 050-14 to 080-125 SeriesMPP, HF, KS 090-26 to 107-125 SeriesMPP, HF, KS 130-26 to 135-125 SeriesMPP, HF, KS 141-26 to 184-125 SeriesMPP, HF, KS 185-26 to 226-125 SeriesMPP, HF, KS 300-26 to 301-125 Series