Mat1 = N27 Epcos Mat2 = N87 Epcos Mat3 = N97 Epcos Mat4 = PC40 TDK Mat5 = 3C90 Ferroxcube Mat6 = 3C94 Ferroxcube Mat7 = 3C95 Ferroxcube Mat8 = 3C96 Ferroxcube Mat9 = 3C97 Ferroxcube Mat10= 3F3 Ferroxcube Mat11= CF139 CosmoFerrites Mat12= K2001 Kaschke Mat13= K2004 Kaschke Mat14= K2006 Kaschke Mat15= 2000NM Russia