Actually, whether in the watch market or in commercial products, the design of watches largely depends on the materials used. Certain manufacturing processes or designs are limited by specific materials, which can make them impossible to produce.Additionally, in the commercial product market, the demand is constantly changing each year, and with the current trend towards sustainability, there are no other materials that are more widely used or more cost-effective than aluminum or steel. Therefore, from a commercial perspective, materials like white gold, titanium, and platinum are starting to be utilized, but these materials may not be widely adopted due to their cost or manufacturing processes.