Tie a Billfisher Ball-Bearing Swivel on your line and fish in confidence. Corrosion-resistant stainless steel construction is impervious to saltwater. Ball bearings allow each end to spin freely, eliminating line twist. Sizes: 2 (per 5), 3 (per 5), 4 (per 4), 6 (per 4), 8 (per 2). Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Swivels.