#6 Ball Chain Fishing Swivel Stainless Steel, 4 Ball Length, 10 Pieces. Ball Chain fishing swivels are MADE IN THE USA and 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). The #6 chain swivel has a ball diameter of 1/8 inch and an average tensile strength of 45 pounds.