The Martin MSP4150 Phosphor Bronze Acoustic Guitar Strings? are a set of 6 acoustic guitar strings. They are made with a bronzed steel core that's then wrapped with a phosphor bronze wire.
The MSP4150 Phosphor Bronze strings have been treated for superior performance, long life and so they repel dirt and grime. This increases the life of the string and keeps the tone as fresh as the day you brought them. The treatment is an extremely thin coating along the string that's so thin, you won't even know it's there.
The main features of the Martin MSP4150 Phosphor Bronze Acoustic Guitar Strings? include: