Mat1 = -2 MicroMetals Red-Clear Mat2 = -8 MicroMetals Yellow-Red Mat3 = -18 MicroMetals Green-Red Mat4 = -26 MicroMetals Yellow-White Mat5 = -45 MicroMetals Black-Black Mat6 = -52 MicroMetals Green-Blue Mat7 = 26u Kool Mu Magnetics Mat8 = 40u Kool Mu Magnetics Mat9 = 60u Kool Mu Magnetics Mat10= 75u Kool Mu Magnetics Mat11= 90u Kool Mu Magnetics Mat12= 125u Kool Mu Magnetics Mat13= MP60 Russia Mat14= MP100 Russia Mat15= MP140 Russia