This weapon (pusaka) is usually inherited from their ancestors. According to Javanese tradition, especially in families, in court, a father was forced to give his son at least a keris obscene.
Keris especially have two main parts, the blade (Wilah) and scabbard (Warangka) divided, in order to protect the blade. Manufacturing process of the blade in the old days can last for one year only for keris. Keris is as Empu filter. Only issue may Empu's high quality keris, physically and spiritually. Empu done in a certain spiritual deeds to prepare a keris, like fasting, sleeping, not for several days and nights, meditation, etc.