Aluminum sheets are primarily composed of aluminum, which is a lightweight and malleable metal. They are made from pure aluminum or aluminum alloys, which may include small percentages of other elements to enhance specific properties such as strength, corrosion resistance, or workability. Common alloying elements include copper, magnesium, manganese, silicon, and zinc. The exact composition varies depending on the specific grade of aluminum and its intended use. Pure aluminum is soft and not commonly used for sheets; instead, alloys are preferred for their improved strength and durability.