Shell Coated Chords of Magic. The Alchemy magic comes from the use of Dean Markley"s exclusive MC394K Bright-Coat compound, derived from a aerospace/satellite technology that possesses super sensitive tonal qualities. LT - 11, 15, 24, 32, 42, 52. CL - 12, 16, 25, 32, 42, 54. MED - 13, 17, 26, 36, 46, 56