We've taken the centuries-old, fish-catching abilities of the popping cork to a whole new level with the GRAND SLAM POPPER 4. We revolutionized the time-tested, basic popping cork with EBS TechnologyTM, which emits the biological sounds of baitfish. No redfish, trout, red drum, cobia, tarpon, flounder, etc. can resist the call of the Grand Slam Popper 4 as it's fished above your live, cut or artificial bait.