Polished. The parts that touch the line have been smoothly polished. When removing the vest from a fish, etc., it rubs frequently, so if it's not polished, the line will gradually be cut. <Specifications> Polished Material: SUS316 Total Length: 4.5cm Thickness: 2mm Recommended Dyneema Line Thickness: 1.6-2mm Weight: 3g The Daruma hook is 2mm thick. It's durable and has minimal resistance. Using 2mm diameter Dyneema line is the best size and won't slip out easily. #anzyproduct's list of 2mm diameter Dyneema ↑Click to see my Dyneema listings