 A popper float, commonly called a 'popping cork' is designed to mimic a large fish feeding at the surface with rod action.There are different styles of popper floats, some use a metal wire with beads at each end to make a clicking noise when pulled through the water, while more modern floats make use of a concave top, which make a deep chugging sound when pulled through the water, imitating the sound of large predator fish feeding at the surface.Some popping corks also have pellets inside, designed to mimic bait fish jumping at the surface when rattled.