It is a patent for fishing rod bait. The dead-flying system is a patent on the bait, which allows it to fly farther when thrown. The search range is larger, which improves the fish-hit rate. The Silver Knife fishing rod is also called the Minnow. It uses a dead fly system. When casting, the lead weight will move to the tail to adjust the center of gravity. When it is in place, it will be pushed back to the front by the spring to resume swimming. There are also designs from other manufacturers. The ball type is based on a principle. The disadvantage is that it does not automatically return to the position and requires a few puffs of bait. The advantage is that it has a noise-inducing fish luring effect.