Swords are typically stored in sheaths when not in use. This prevents the blade from injuring people while being carried on the side or back of a person. Swords can be made of various types of metals depending on the age and function. Not all swords are weapons as some are ceremonial swords while others, that are made from bamboo, are used to teach people how to use them. Even if they aren't created for injuring people, bamboo swords can sting or leave marks.