Jigging World Fish Finders comes 10 pieces to a pack. They are braided line friendly and comes with a durable duo lock snap for sinkers. A fish finder is used commonly when an angler is bait fishing and would like the fish to bite your bait offering & run without any tension on the line. Commonly used reels for this application are bait runner style reels and conventional reels left in free spool with the clicker on.