This is a really cool instrument! It is a tenor ukulele strung and tuned as normal, only instead of a High G or Low G as the 4th string you have both. The addition of the extra string gives a real boost to the low end, whilst keeping the sweet high that the traditional re-entrant high G brings. It makes the ukulele very loud and strong in sound – great for standing out at a uke club or performing on stage. This is one of my favourite ukes in terms of sound and playbility – up there with solid wood ukes three times the price.