Dm4 Flutes - The low tone of the D flute makes it attractive to many people. The larger the flute, the more breath control is required. Also the distance between the holes begins to increase making it difficult for some people to play.The larger flutes actually require less breath pressure and considerably more breath control. Also they can be a real challenge for small hands and/or short arms. I have had several women purchase D flutes, only to return them for E.