Most quality-made sitars are constructed from a combination of teak and mahogany wood called toon wood. Teak is a rare wood, so a sitar built of one often has an air of mystique about it, and it also suggests that the sitar is old, as they are expected to last 30-40 years. Also, because the sitar is under a lot of tension from the strings, it will eventually start to bend, throw the frets off, and generally become harder to play. Even the best made sitars are prone to this, and will eventually require the neck to be replaced.