What new material was formed in the head of the hammer?

The head of the hammer is typically made from materials like steel or a high-carbon alloy, designed for durability and impact resistance. In some cases, specialized materials such as forged steel or even advanced composites may be used to enhance performance. These materials are engineered to withstand repeated stress and provide effective striking power. If the hammer has undergone a specific manufacturing or treatment process, this could introduce additional properties or coatings for improved functionality.