Description: Made of high quality copper, corrosion resistant and long life. Flexible rotation, not easy to wind around the fishing line. Matt black reduces visibility under water. With high tension strength. Specially shaped ring is designed to hold onto the knot on top of the PVA bag, allowing quick attachment of the bags. Specification: Material: Copper Length: approx.28mm / 1.1inch Color: Matt Black Package Includes: 20 Pieces Rolling Swivel with Snap