The all new Martin SP Lifespan acoustic guitar strings are treated with Cleartone Proprietary Technology to bring you the longest possible string life without sacrificing tone or natural feel. So natural we challenge you to identify the treated string.

Martin SP Lifespan strings are designed to repel oils and dirt that can deaden strings. ALL six strings are treated to preserve the natural Martin SP sound and feel that players prefer.

Martin Guitar is so confident in the new Lifespan strings that we are shipping our guitars with Lifespan strings as standard equipment.

Superior Performance meets long life. Rich tone. Without sacrifice.