Powder cores are distributed air gap cores made from ferrous alloy powders for low losses at high frequencies. Small air gaps distributed evenly throughout the cores increase the amount of DC that can be passed through the winding before core saturation occurs. Molybdenum Perm-alloy Powder (MPP) cores are excellent for low loss inductors such as switching regulators and noise filters.  High Flux, Sendust and Mega Flux cores are better choice for Power Factor Correction (PFC), switching regulator inductors, in-line noise filters, pulse and flyback transformers, and many other applications required for low losses at high frequencies.