Engraving pens, also known as styli, are specialized tools used to create intricate designs on a variety of surfaces. They are typically composed of a metal tip attached to a handle and are used to etch or carve into materials such as wood, stone, glass, and metal. The metal tip is usually made of a hard material such as diamond, tungsten carbide, or steel. Engraving pens are often used in the production of jewelry, watches, and other decorative items. They can also be used for creating artwork, signage, and other forms of decoration.