The One Knocker Spook thumps bass with a sound like no other topwater bait. The single tungsten rattle contained in a sound intensifying chamber produces a loud, “thump” with every twitch that draws fish from long distances. It´s positioning within the body of the lure makes walking-the-dog easier than ever. The Heddon Saltwater One Knocker Spook is equipped with saltwater hooks made for bigger fish.