The term 'neck attachments' refers to the two components of a guitar that are attached to the neck of the instrument. The first component is the capo, which is a device used to raise the pitch of the strings and create different sounds. It is usually made of metal or plastic and is secured to the fretboard with a clamp. The second component is the nut, which is a small piece of plastic or bone that is placed at the end of the fretboard and helps to keep the strings in place. Both of these components are essential for playing the guitar and creating different sounds.