Thank you for viewing. This is a bishoma (fishing weight) for sea bream, Spanish mackerel, yellowtail, rockfish, etc. It likely has over 80 through-hole sinkers of size 1 attached. Including the rig, it weighs about 0.8 kg. The length is probably around 25m. It appears to be handmade, so I don't know the details. Please refer to the photos to make your judgment.