This is a fishing tool called "Nora Tongari Kago M-15" from Marushin Fishing Tackle. * This is a type of chum basket (maki-e kago) used for sabiki fishing, etc. * The "Tongari Kago" sinks quickly due to its weight, making it suitable for fishing for horse mackerel in the mid-layers or bottom. * "15" indicates the weight of the basket, which is approximately 56g.