Also known as bowl gold, it is a helmet worn by the Japanese samurai class in battles and ceremonies. Not only is it an important component of samurai equipment, but it is also a symbol of Japanese culture and art. The designs are diverse, ranging from simple conical shapes to complex decorative helmets, reflecting the social status and personal taste of warriors. In battle, Bo Jin not only provides protection, but also serves as a deterrent to the enemy. The design aims to protect the warrior's head from damage from swords and arrows. The shape and decoration of the helmet help identify enemies and allies on the battlefield, while also reflecting the bravery and dignity of warriors. It is a part of Japanese history and culture.