Small piece of coffee stir straw with the ends crimped and sealed to create an air pocket. I remember years ago Mr Twister made a plastic called a slimmy Slug. About 4 inches long. Heavy enough to cast with spinning gear. Was made to sink slowly with a 4/0 worm hook rigged weedless. Those things allowed to sink and jerked like a dying shad. Those bass would knock the snot out that thing.