those guitars would have a C shape neck, with a 1 5/8 nut width...the C is a good all around shape of neck, but I prefer a wider nut width. BUt to answer your question it is a C...a U would be much deeper, a V would have a peak in the back of the neck a soft V wold have a softer peak that a V neck, a D would be a pretty shallow neck, the list goes on.