Mustad 77210 Swivels are designed to eliminate line twist and make a dependable and strong link between the main line and a leader. The Mustad Swivel is made from high quality materials and will not let you down. When choosing a swivel always go small. Pick a swivel, which will match the breaking strength of your line. This will give the best performance and presentation. When tying your fishing line to the swivel eye make sure to center the knot, as this will ensure the best rotation. Made from brass, for either saltwater or freshwater use. Black Nickel finish.