Available in various sizes. Ball sinkers are popular for running sinker rigs, where the main line is threaded through the sinker and left unattached, so it can move more freely. They are often positioned either running directly to the hook, or restricted to running along the main line above a swivel connection. Popular for running sinker rigs. Because of their shape, ball sinkers offer the optimum shape for casting. On the downside, the shape means reduced holding power as the ball can be rolled by surge or wash. Ball sinkers are ideal when fishing current in fresh or salt water where you want the terminal rig to move while keeping bait near the bottom.