Jarvis Walker Ball Sinkers are a very popular sinker choice for fishing in fresh or saltwater. They are commonly used for running sinker rigs, where the main line is threaded through the sinker and left free to slide along the line. This rig system allows baits to move around, covering more area while keeping the bait near the bottom. They can be rigged to run directly to the hook, or restricted to the main line above a swivel connection.