The Superline Swivel is manufactured in Japan from premium components offering a superior strength to size ratio and an NSB (nickel silver black) coating is applied for a stealthy finish that resists corrosion. Swivels are available in sizes 10 to 1, with break strengths of 35 to 330 pounds. Whether you chase Bluegill or Bigeye, Gamakatsu has a swivel for you.