This item is a sinker used in a
fishing tackle called "tairaba," which is primarily used to catch sea bream. As shown in the "Reference diagram showing the names of each part" and "Reference diagram showing the state of use," the "tairaba" has a
fishing line passed through the tai rubber head, which also serves as a sinker, and a connector attached to the end of the
fishing line. The connector is fitted with a leader equipped with a hook, a tie to attract fish, and a skirt. This item is detachably attached so as to cover one end of the tai rubber head, allowing the weight of the "tairaba" to be adjusted.