Martin Ultratone Guitars is an authorized dealer of Martin guitar strings and accessories. C.F Martin & Co. has been creating the finest instruments in the world for over 175 years. Martin guitars and Martin Strings are the instruments and strings of choice for musicians around the world, from the icons of rock, country, folk and bluegrass to those just beginning their careers. The company is also known for producing high-quality, popular acoustic guitar strings. These include the Martin SP® LIFESPAN™ line - the fastest-growing treated string in the industry, and the Martin SP line - which uses an industry leading core wire to hold tunings better.