Rosco Barrel Swivels are used to prevent fishing line from becoming twisted, which can cause stressed, frayed, weakened or tangled line. Swivels can also be used to link 2 pieces of line together, or to attach a line to a leader. Very durable, Rosco Swivels will pivot freely and are made with anticorrosive material to avoid freezing up. Per 36. Sizes: 10 (30 lb.), 7 (75 lb.), 5 (90 lb.), 3 (100 lb.), 1 (150 lb.), 2/0 (225 lb.), 4/0 (350 lb.), Colors: Black, Brass. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Barrel & Crane.