The Scum Frog Pro Series frog has a glass rattle designed for maximum noise. It is also attached to the bottom of the hook, well out of the way for a good hook set, but attached directly to the steel shank to magnify the noise under water. 3-D Molded Eyes provide a realistic look. The Pro Series frogs have 4/0 Owner Hooks which are slightly pointed up for more catching power. The nose ring gives more freedom of movement to help walk the dog.