Check the listing for details. Fishing Barrel Swivels, 40Pcs 28LBS Copper Rolling Terminal Tackle, Black. Condition: New. Listed at 5.44 USD. The barrel swivel is used to connect the line leading from a rod to a lure to untwist the line to avoid tangling during retrieval.SpecificationColor: BlackStrength: 13kg / 28 lbsMaterial: CopperSurface Treatment: PolishingOverall Length: 9mm / 0.35 inchRing Outer Diameter: 2mm / 0.08 inchPackage Content: 40 x Fishing Barrel SwivelsAdvantage1. This swivel connector is made of polished copper. Smooth surface will not cut fishing line.2. Barrel swivel can ensure 360-degree rotation flexibility under strong tension, thus reducing twist to a minimum.InstructionJust tie the fishing line connected to the fishing rod to the ring of the swivel.NOTE: Please confirm the size and strength of the snap swivel you need before ordering.