The Martin 00-42SC John Mayer Custom Signature Acoustic Guitar embodies the rich tonality of a ‘00’ 12-fret design with solid cocobolo sides, back and headplate, and a solid sitka spruce top. Built in collaboration with John Mayer, the 00-42SC features gorgeous ‘42’ style appointments. The ‘SC’ stands for stagecoach, harkening back to an era when guitars were taken on trains, wagons, and horses for bringing people together in song. The interior label is signed by John himself.