The sound increases the curiosity in fish and triggers the investigation. These baits actually have harmonious, uniform and "in tune" sound frequencies with nature. This secret of sound combined with the legendary Rapala ® "waver" is what makes this call so effective. Long-casting, Lipless design makes this lure vital wherever you can fish. Fast RIP or slow running, either way it sounds like the dinner bell to fish. Equipped with Premium VMC ® Black nickel hooks. Each recall is hand-tuned and Tank-tested for final performance right out of the box.