LongLiner® No Twist!
Made from two Sampo® 150# ball bearing swivels separated by hard mono. Prevents line twist when placed in-line between leader and mainline, particularly helpful with braids. No Twist! prevents tangles due to rotation. Great for use with rotating baits (Sure Spin, Spinners, spoons) and flashers.
Comes in 2 sizes: 50# and 125#