In music, transposition refers to the interpretation of a music piece in a different scale or tuning. In other words, it's the process of playing a collection of notes (aka a song) up or down in pitch. Magma's GCT-E Transpositor strings keep the standard tuning of the guitar (E-A-D-G-B-E), but with a sound that's a full octave lower for a rich bass sound. This strings are ideal for any musical style, and the sounds the create were inspired by classic acoustic rock and Argentine Tango. These strings are made of a silver plated copper wire wrapped around a nylon core, providing the same bright sound that you get from metallic strings. These acoustic guitar are designed to maintain the same standard tension that normal strings create, allowing them to be used on any classical guitar. Because Magma's classical transpositor strings allow you to play in a wide variety of tunings, these strings are perfect for guitar ensembles, live performances, and experimental pieces. Visit Magma's Amazon store for all your musical accessories.