Aluminum is extremely popular. It has a low density, good corrosion resistance, and high thermal conductivity, making it suitable for a wide range of applications, from aircraft parts to cookware. Iron, especially cast iron, is another commonly cast metal. It has excellent castability and high compressive strength and is often used in engine blocks, pipes, and machinery parts. Copper and its alloys, such as brass and bronze, are also widely cast. They offer good electrical and thermal conductivity as well as attractive aesthetic properties, which is why they are used in electrical components, decorative items, and musical instruments.