Ferrous Alloy materials are similar to the Sendust material originally develop by Arnold Engineering, but with improvements. Saturation level is 10.5 kilogauss. Like powdered iron, the ferrous alloy is thoroughly mixed with a binding material, then pressed in a press to form a core. It has lower core losses than the powdered iron. It is also used for ripple filter inductors in D.C. power supplies. It becomes the preferred choice over powdered iron at higher A.C. flux levels.