Rapala Rattlin' Raps offer more than just a basic rattle. These lures produce sound frequencies that are uniform, harmonic, and in tune with nature. The sounds produced combined with the legendary Rapala wobble makes these lures lethal against all sorts of game fish. Rapala Rattlin' Raps can be cranked fast or slow and each one is hand tuned and tank tested to ensure they run true right out of the box.