These can also be called neck thru or thru necks. These kinds of necks use one piece of wood which run through the whole length or the guitars body. The is called the ‘stick’. The side parts of the guitar are called the ‘wings’ which are glued onto the ‘Stick’. Some guitarists believe this method of construction increases the sustain over bolt on or glued necks. Thru necks also allow easier access to the higher frets as they don’t have a heel. One disadvantage of a thru neck over other necks such as a bolt is the difficulty in repairing the neck if it gets damaged.