Different materials are used in buckle manufacturing to provide strength, durability, and flexibility in design. Stainless steel is used because it is strong and resistant to rust, making the buckle long-lasting. Zinc alloy is commonly used as it is easy to mold into different shapes and detailed designs. Brass adds durability and a polished appearance, often used for high-quality buckles. Aluminum is lightweight yet sturdy, making it suitable for products where less weight is needed. Plastic or polymer materials are used for lightweight and cost-effective buckles commonly found in bags, belts, and straps. Together, these materials help produce buckles that are strong, functional, and suitable for various garments and accessories.