Made of high quality stainless steel, sturdy and durable, not easy to break. Delicate workmanship with good texture, smooth surface is not easy to damage the line, suitable for all kinds of fishing line. You can push the snap open easily with your thumb, and they’re compatible with a variety of different lure types. Advanced dual Spinning design, lubricated stainless steel bearing balls provides consistent smooth performance. Dual spinning design eliminates line twisting. A set comes 50pcs, ensure your long time use. It is used for connection of trunk and branch lines.The upper and lower rings are designed to ensure maximum vertical and sensitivity of the fishing line.