What were British tanks made of during ww1?

During World War I, British tanks were primarily made of steel, which provided the necessary armor for protection against enemy fire. The earliest tanks, like the Mark I, featured a riveted steel hull, while later models incorporated improved welding techniques for better structural integrity. Additionally, the tanks had a wooden chassis to support their heavy armor and were designed for mobility across rough terrain. Overall, the combination of steel and wood aimed to balance durability and weight for combat effectiveness.