2. Bridge: The bridge of a guitar is usually made of metal, although some can be made of wood or other materials.
3. Tailpiece: The tailpiece of a guitar is usually made of metal, although some can be made of wood or other materials.
4. Tuners: The tuners of a guitar are usually made of metal, although some can be made of plastic or other materials.
5. Frets: The frets of a guitar are usually made of metal, although some can be made of plastic or other materials.
6. Nut: The nut of a guitar is usually made of metal, although some can be made of bone or other materials.
7. Truss rod: The truss rod of a guitar is usually made of metal, although some can be made of composite materials.
8. Control plate: The control plate of a guitar is usually made of metal, although some can be made of plastic or other materials.
9. Knobs: The knobs of a guitar are usually made of metal, although some can be made of plastic or other materials.
10. Jack plate: The jack plate of a guitar is usually made of metal, although some can be made of plastic or other materials.
11. End pin: The end pin of a guitar is usually made of metal, although some can be made of plastic or other materials.
12. Strap buttons: The strap buttons of a guitar are usually made of metal, although some can be made of plastic or other materials.
13. Pickguard: The pickguard of a guitar can be made of metal, although it is more commonly made of plastic or other materials.