Ball Chain fishing swivels work so well because they prevent the line from twisting, and they can also send bubbles over the trailing lure to make it look like the lure has come alive. The swivel chains are made of stainless steel with round wire end rings (as opposed to flat end rings).
Ball Chain swivels are available in 4 or 6 ball length and are sold in bulk at low factory direct wholesale prices. Available finishes include stainless steel color or black coated stainless steel (the black finish is extremely durable and it will not affect the flexibility of the chain).
The #6 ball chain swivel has a ball diameter of 1/8" and an average tensile strength of 45 pounds.
The #10 ball chain swivel has a ball diameter of .175" and an average tensile strengths of 100 pounds.