These cores are composed of a powdered alloy of about 79% nickel, 4% molybdenum, and 17% iron. Saturation is about 7.5 kilogauss. Their high nickel content makes them very expensive. These powdered cores have the lowest losses of all the powdered cores. It has the best A.C. characteristics under heavy D.C. biasing. Because of its expense, its use is limited to the more critical applications that demand its superior properties. D.C. biased High Q coils operating at high frequency in tuned circuits is one example.