C.F. Martin Web Site What guitar player hasn't used Martin strings at some point? The Martin Regulars and Martin Marquis remain tried and true sets while the SP series has also become a best seller. Martin's newest sets, the coated SP+, combines the SP quality with the enhancement of a polymer coating to bring the world of guitar strings into the high-tech environment of the 21st century guitar player. Martin Acoustic Strings Martin 12-String Sets Martin Mandolin Strings Martin/Vega Banjo Strings String Anatomy 101