This is a pipe balance for bottom fishing such as "bukkomi" fishing, stone bream, and grouper fishing. It is designed to improve bite penetration and reduce snagging with a guided sinker. The diameter is 4mm and it smoothly passes through up to 100-go nylon line. We have already lowered the price to the limit, so further price reductions are difficult. We also have other items for large fish rigs, "iso bukkomi" fishing, and live bait fishing for horse mackerel, so please comment if you wish to purchase multiple items, and we will offer a discount on shipping costs.