The 540S is an S series solid body electric guitar model introduced by Ibanez in 1987. It was originally called the PRO540 Saber as part of the Roadstar II/Roadstar Pro series. It was the initial model in what would come to be known as the S series. The series is distinguished by the sleek double cutaway body shape which is arched on the top and back resulting in a fairly light guitar with thin edges. The 540S has a traditional bolt-on neck joint with a stamped metal plate. For 1991 the original Edge tremolo was replaced by the new low-profile version.