Snapped swivel, with ball bearing sealed, is widely used as connector for single line kite and spinning obejects, like windsock, bol kites, spinning tubes, etc. Coppery stainless steel and welded ring offer excellent resistance to corrosion for long service life. SMOOTH with BALL BEARING! The swivel has ball bearings sealed inside to minimize any friction and allow the swivel to rotate freely, which prevents fishing / kite line from twisting when loaded. When used as accessories of fishing, stainless steel is perfect for heavy freshwater or saltwater use.