The 540S-HH is an S series solid body electric guitar model introduced by Ibanez in 1988. It was part of the Roadstar II/Roadstar Pro series. It was also referred to as the 540SHH. It was an early 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-HH has a traditional bolt-on neck joint with a stamped metal plate. The 540S is a similar model with a humbucker/ single-coil/ single-coil pickup arrangement.