Martin strings are the acoustic string of choice for musicians around the world. State-of-the-art equipment winds their strings to exacting specifications. The result is a string that you can depend on for tone, clarity and brightness on a daily basis. Featured here are the Martin M-640 Nickel alloy wound dulcimer strings with a loop end. This set of four strings includes strings gauges of .012, .012, .012 and .022, making this set best for DAA tuning (we would recommend lighter strings for DAD tuning).