The One Knocker Spook thumps fish 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. Its positioning within the body of the lure makes walking-the- dog easier than ever. The Heddon Saltwater One Knocker is equipped with saltwater hooks made for bigger fish. Perfect for Redfish and Trout.